Hi Eric,<br><br>As you know I have been working on combining some
recent EVLA data with some WSRT data. I have managed to process the
data sets such that when I image them the velocity range, center
velocity, and channel width are correct. The emission in both data sets
appears in the same channels. However, I have the problem that the
headers look different. The two image headers are pasted below. I am
not sure how to change the specific header values. Not sure which
values correspond with which ctype and crval and cdelts, etc to use.
<br>
<br>Danielle <br><br><br>AIPS 1: Image=ugc09519 (UV) Filename=UGC9519WSRT .UVSRT . 2<br>AIPS 1: Telescope=WSRT Receiver=WSRT<br>AIPS 1: Observer=ProcessD User #= 22<br>AIPS 1: Observ. date=13-JUL-2008 Map date=10-FEB-2013<br>
AIPS 1: # visibilities 52997 Sort order TB<br>AIPS 1: Rand axes: UU-L VV-L WW-L BASELINE TIME1<br>AIPS 1: ------------------------------<div id=":104">----------------------------------<br>AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat<br>
AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00<br>AIPS
1: STOKES 2 -5.0000000E+00 1.00 -1.0000000E+00 0.00
<------- (this is -5 while the other data set has -1 not sure what this means)<br>AIPS 1:
FREQ 85 1.4223603E+09 149.65 9.4209562E+04 0.00
<------- (still has a reference with respect to pixel 149)<br>
AIPS 1: RA 1 14 46 21.102 1.00 3600.000 0.00<br>AIPS 1: DEC 1 34 22 14.502 1.00 3600.000 0.00<br>AIPS 1: ----------------------------------------------------------------<br>
AIPS 1: Coordinate equinox 2000.00<br>AIPS 1: Rest freq 1420.406 Vel type: OPTICAL wrt SUN<br>AIPS 1: Alt ref. value -4.27695E+05 wrt pixel 149.65<br>AIPS 1: Maximum version number of extension files of type HI is 1<br>
AIPS 1: Maximum version number of extension files of type FO is 1<br>AIPS 1: Maximum version number of extension files of type AN is 1<br>AIPS 1: Maximum version number of extension files of type FQ is 1<br>AIPS 1: Maximum version number of extension files of type NX is 1<br>
<br><br>-----<br>AIPS 1: Image=UGC9519 (UV) Filename=U9519 .SPECR . 1<br>AIPS 1: Telescope=EVLA Receiver=EVLA<br>AIPS 1: Observer=Katherin User #= 22<br>AIPS 1: Observ. date=25-JUL-2012 Map date=24-AUG-2012<br>
AIPS 1: # visibilities 5464880 Sort order<br>AIPS 1: Rand axes: UU-L-SIN VV-L-SIN WW-L-SIN TIME1 BASELINE<br>AIPS 1: INTTIM<br>AIPS 1: ----------------------------------------------------------------<br>
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat<br>AIPS 1: COMPLEX 3 1.0000000E+00 1.00 1.0000000E+00 0.00<br>AIPS 1: STOKES 2 -1.0000000E+00 1.00 -1.0000000E+00 0.00<br>
AIPS 1: FREQ 85 1.4085875E+09 1.00 9.4117648E+04 0.00<br>AIPS
1: IF 1 1.0000000E+00 1.00 1.0000000E+00
0.00 <----- (entry missing in the other data set)<br>AIPS 1: RA 1 14 46 21.127 1.00 3600.000 0.00<br>
AIPS 1: DEC 1 34 22 14.340 1.00 3600.000 0.00<br>AIPS 1: ----------------------------------------------------------------<br>AIPS 1: Coordinate equinox 2000.00<br>AIPS 1: Rest freq 1420.406 Vel type: OPTICAL wrt SUN<br>
AIPS 1: Alt ref. value 1.69200E+06 wrt pixel 43.50<br>AIPS 1: Maximum version number of extension files of type NX is 1<br>AIPS 1: Maximum version number of extension files of type FO is 1<br>AIPS 1: Maximum version number of extension files of type FQ is 1<br>
AIPS 1: Maximum version number of extension files of type AN is 1<br>AIPS 1: Maximum version number of extension files of type WX is 1<br>AIPS 1: Maximum version number of extension files of type HI is 1</div><br><br>