[daip] moment maps

[Yoshiaki Hagiwara]

Dear AIPS staffs,

Please let me ask on AIPS image analysis.

I made a 1st moment map of the VLA-A data using the MOMNT, in which
one can see weak velocity gradient (10 kms/0.1arcsec) along PA=-20deg.
The detected velocity field on the map extends within 0.1 arcsec, 
and the beam size is 0.1 arcsec.

However, there is no such a velocity gradient, looking
at the P-V map, sliced at PA=-20deg! 

I guess that the velocity gradient seen in the moment map 
is false. How can I clarify, when the production of moment 
maps goes wrong?

Thanks.


Cheers,
Hagi