How to determine semimajor axis in the contour plot from recoveries.csv file

[aberrico]

Hi.
I'm running rvsearch with these commands:
rvsearch find -s path-to-setup
rvsearch plot -t summary -d path-to-outputdir
rvsearch inject -d path-to-outputdir
rvsearch plot -t recovery -d path-to-outputdir

From the contour plot I need to determine the semimajor axis that corresponds to a Jupiter mass planet. I mean, if I could draw a horizontal line at the Jupiter mass value and see where it cuts the 50% probability contour (dark curve), I would draw a vertical line and determine the semimajor axis. That's visually my problem. I'm trying to do this working on the recoveries.csv file. What I don't know is how to determine the 50% probability contour (how do you get the dark curve in the plot).
Thank you