create mapping for the variables

Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>

nimare/reports/base.py

@@ -484,15 +484,12 @@ def __init__(
                 )
             elif meta_type == "IBMA":
                 # Use "z_maps", for Fishers, and Stouffers; otherwise use "beta_maps".
-                if "z_maps" in self.results.estimator.inputs_:
-                    key_maps = "z_maps"
-                    x_label = "Z"
-                elif "t_maps" in self.results.estimator.inputs_:
-                    key_maps = "t_maps"
-                    x_label = "T"
-                else:
-                    key_maps = "beta_maps"
-                    x_label = "Beta"
+INPUT_TYPE_LABELS = {'z_maps': 'Z', 't_maps': 'T', 'beta_maps': 'Beta'}
+for key_maps, x_label in INPUT_TYPE_LABELS.items():
+    if key_maps in self.results.estimator.inputs_:
+        break
+else:
+    key_maps, x_label = 'beta_maps', 'Beta'
 
                 maps_arr = self.results.estimator.inputs_[key_maps]
                 ids_ = self.results.estimator.inputs_["id"]