F. Neyer published this image within the TBG team on 2014-05-07. After 49.5 hours exposing time a further possible tidal tail appears around NGC 4631/56. The coordinates of the three dwarf companions are:

N4631dw1: RA 12 h 40 min 57.0 s DEC +32 ° 47 ‘ 33 ”
N4631dw2: RA 12 h 42 min 06.8 s DEC +32 ° 37 ‘ 15 ”
N4631dw3: RA 12 h 42 min 52.5 s DEC +32 ° 27 ‘ 35 ”
(Have also a look into the two publications in the sub-page “publications in collaboration with the TBG Group”.)