Missing negative sign in relative shifts!

wfm_stitching/wfm_processing.py

@@ -62,9 +62,9 @@ def get_frame_shifts(frequency_wfm_psc=None):
 
     relative_shifts = (_tof_shifts(_wfm_psc_1(), psc_frequency=frequ1)  + \
                        _tof_shifts(_wfm_psc_2(), psc_frequency=frequ2)) * \
-                       5.0e+05
+                       5.0e+05 # factor of 0.5 * 1.0e6 (taking mean and converting to microseconds)
 
-    return relative_shifts
+    return -relative_shifts
 
 def make_frame_shifts(initial_shift, other_shifts=(-2420, -2253, -2095, -1946, -1810)):
     """