add a name to the output plot

proxtoolbox/experiments/orbitaltomography/orbitExperiment.py

@@ -91,7 +91,7 @@ class OrbitalTomographyExperiment(Experiment):
         :return:
         """
         self.output['plots'] = []
-        convergence_plots, ax = subplots(1, 2, figsize=(7, 3))
+        convergence_plots, ax = subplots(1, 2, figsize=(7, 3), num="Convergence plots")
         if 'change' in self.output['stats']:
             change_key = 'change'
         else: