diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -189,7 +189,7 @@ A detailed example is available as a [IPython Notebook](examples/example-2-evolu
 `neurolib` also implements evolutionary parameter optimization, which works particularly well with brain networks. In an evolutionary algorithm, each simulation is represented as an individual and the parameters of the simulation, for example coupling strengths or noise level values, are represented as the genes of each individual. An individual is a part of a population. In each generation, individuals are evaluated and ranked according to a fitness criterion. For whole-brain network simulations, this could be the fit of the simulated activity to empirical data. Then, individuals with a high fitness value are `selected` as parents and `mate` to create offspring. These offspring undergo random `mutations` of their genes. After all offspring are evaluated, the best individuals of the population are selected to transition into the next generation. This process goes on for a given amount generations until a stopping criterion is reached. This could be a predefined maximum number of generations or when a large enough population with high fitness values is found.
 
 <p align="center">
-  <img src="https://github.com/neurolib-dev/neurolib/raw/master/resources/evolutionary-algorithm.svg", width="600">
+  <img src="https://github.com/neurolib-dev/neurolib/raw/master/resources/evolutionary-algorithm.png", width="600">
 </p>
 
 `neurolib` makes it very easy to set up your own evolutionary optimization and everything else is handled under the hood. Of course, if you like, you can dig deeper, define your own selection, mutation and mating operators. In the following demonstration, we will simply evaluate the fitness of each individual as the distance to the unit circle. After a couple of generations of mating, mutating and selecting, only individuals who are close to the circle should survive:
diff --git a/resources/evolutionary-algorithm.png b/resources/evolutionary-algorithm.png
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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 218px; margin-left: 172px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Rank select parents</div></div></div></foreignObject><text x="231" y="221" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">Rank select parents</text></switch></g><path d="M 1155 1188.9 L 1155 1234.41" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1155 1279.41 L 1132.5 1234.41 L 1177.5 1234.41 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><path d="M 1405 731.9 L 1155 732 L 1155 938.31" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1155 983.31 L 1132.5 938.31 L 1177.5 938.31 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><path d="M 1605 731.9 L 1870 732 L 1870 1234.41" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1870 1279.41 L 1847.5 1234.41 L 1892.5 1234.41 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><path d="M 1870 1885 L 1505 1885 L 1870 1885 L 1870 1485" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><rect x="1202.85" y="0" width="600" height="200" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 59px; height: 1px; padding-top: 167px; margin-left: 452px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; "><font><font style="font-size: 12px">Stop?</font><br /></font></div></div></div></foreignObject><text x="481" y="171" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">Stop?&#xa;</text></switch></g><rect x="1882.85" y="260" width="550" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 108px; height: 1px; padding-top: 62px; margin-left: 378px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Increment<br style="font-size: 10px" />generation counter</div></div></div></foreignObject><text x="432" y="65" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">Increment...</text></switch></g><path d="M 1805 2086.3 L 2455 2086.5 L 2455 1683.34" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 2455 1638.34 L 2477.5 1683.34 L 2432.5 1683.34 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><path d="M 1505 620.2 L 1605 731.9 L 1505 843.6 L 1405 731.9 Z" fill="#ffffff" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 38px; height: 1px; padding-top: 146px; margin-left: 282px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; "><font><font style="font-size: 10px">Valid?</font><br /></font></div></div></div></foreignObject><text x="301" y="150" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">Valid?&#xa;</text></switch></g><path d="M 1502.85 485 L 1504.2 569.62" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1504.91 614.61 L 1481.7 569.97 L 1526.69 569.26 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><rect x="1155" y="620.2" width="247.85" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 134px; margin-left: 232px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Yes</div></div></div></foreignObject><text x="256" y="137" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">Yes</text></switch></g><rect x="1605" y="620.2" width="250" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 134px; margin-left: 322px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">No</div></div></div></foreignObject><text x="346" y="137" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">No</text></switch></g><path d="M 1280 735 L 1280 885 L 1505 885 L 1505 1785 L 2356.5 1785 L 2356.6 1680.64" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 2356.64 1635.64 L 2379.1 1680.66 L 2334.1 1680.62 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><rect x="2109.65" y="1686.3" width="247.85" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 347px; margin-left: 423px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Old</div></div></div></foreignObject><text x="447" y="350" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">Old</text></switch></g><rect x="2205" y="1986.3" width="247.85" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 407px; margin-left: 442px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">New</div></div></div></foreignObject><text x="466" y="410" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">New</text></switch></g><path d="M 2131.52 1332.75 L 2681.46 1332.75 C 2688.78 1333.02 2695.45 1336.15 2699.22 1341.11 C 2702.99 1346.07 2703.36 1352.18 2700.21 1357.4 L 2418.99 1628.61 C 2411.48 1632.74 2401.51 1632.74 2394 1628.61 L 2112.77 1357.4 C 2109.63 1352.18 2110 1346.07 2113.77 1341.11 C 2117.54 1336.15 2124.2 1333.02 2131.52 1332.75 Z" fill="#ffffff" stroke="#000000" stroke-width="5" stroke-miterlimit="10" transform="rotate(180,2406.52,1482.75)" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 117px; height: 1px; padding-top: 324px; margin-left: 423px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; "><span style="white-space: normal ; font-size: 12px">Merge<br style="font-size: 12px" />old and new<br style="font-size: 12px" />individuals<br style="font-size: 12px" /></span></div></div></div></foreignObject><text x="481" y="324" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">Merge...</text></switch></g><rect x="2205" y="585" width="250" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 127px; margin-left: 442px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">No</div></div></div></foreignObject><text x="466" y="130" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">No</text></switch></g><path d="M 2406.52 1332.75 L 2406.52 1039.49" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 2406.52 994.49 L 2429.02 1039.49 L 2384.02 1039.49 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><rect x="2805" y="737.35" width="600" height="200" rx="30" ry="30" fill="#ffffff" stroke="#000000" stroke-width="5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 167px; margin-left: 562px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">End of evolution</div></div></div></foreignObject><text x="621" y="171" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">End of evolution</text></switch></g><path d="M 2558.05 837.38 L 2754.41 837.36" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 2799.41 837.35 L 2754.41 859.86 L 2754.41 814.86 Z" fill="none" stroke="#000000" stroke-width="5" stroke-miterlimit="10" pointer-events="all"/><rect x="2505" y="737.35" width="250" height="100" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 48px; height: 1px; padding-top: 157px; margin-left: 502px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Yes</div></div></div></foreignObject><text x="526" y="160" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">Yes</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://desk.draw.io/support/solutions/articles/16000042487" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Viewer does not support full SVG 1.1</text></a></switch></svg>
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