Corrected a typo that caused AcouSed to crash when selecting a frequency couple in the 'Sediment calibration' tab.

View/sediment_calibration_tab.py

@@ -1080,7 +1080,7 @@ class SedimentCalibrationTab(QWidget):
         if stg.depth_cross_section[data_id].shape != (0,):
             depth_data = stg.depth_cross_section
         else:
-            depth_date = stg.depth
+            depth_data = stg.depth
 
         val_min = np.nanmin(
             BS_data[data_id][freq2, :, :]