resolve.re: flip v coordinate

resolve/re/response.py

@@ -171,6 +171,8 @@ def InterferometryResponseDucc(
         epsilon=epsilon,
         do_wgridding=do_wgridding,
         nthreads=nthreads,
+        verbosity=verbosity,
+        flip_v=True,
     )
     wgridder = Partial(wg, observation.uvw, observation.freq)