average multiple sphere projections

tools/projectSphere.py

@@ -300,6 +300,7 @@ def projectSphereMM(spheresPositionMM, radiiMM, ROIcentreMM=None, ROIradiusMM=No
                 #                              spheresPositionMM.astype('<f4'),
                 #                              displacementsMM.astype('<f4'),
                 #                              projectionXmm)
+                projectionXmm /= n_delta
         elif ROIcentreMM is not None and ROIradiusMM is not None:
             # Make sure there's only one sphere:
             assert(len(spheresPositionMM.ravel())==3), "projectSphere.projectSphereMM(): in ROI mode I want only one sphere"