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<font face="Arial">Hi Eric - curious question. given past history,
likely user error, but i can't find it.<br>
<br>
Running XMOM on a (nonstandard) map with Faraday spectra along
rows (blanked at amplitude of 1e-5). Can't understand moments 0
and 2.<br>
<br>
Here is the header and the moments calculated on row 483 of the
following image:<br>
<br>
AIPS 1: Image=A2256 (MA)
Filename=A2256SA16C_R.FAMPRO. 1<br>
AIPS 1: Magic value blanking<br>
AIPS 1: Minimum= 10.0002 Maximum= 48.5521
MicroJY/BEAM<br>
AIPS 1:
--------------------------------------------------------------<br>
AIPS 1: Type Pixels Coord value at Pixel Coord incr
Rotat<br>
AIPS 1: ANGLE-PAIR AXES INCONSISTENT OR PARTLY MISSING<br>
AIPS 1: RAD/M2 801 0.000000E+00 401* 5.0000E+00
0.00<br>
AIPS 1: RA---SIN 600 17 03 37.300 300* -0.150000
0.00<br>
AIPS 1:
--------------------------------------------------------------<br>
AIPS 1: Map type=NORMAL Number of iterations= 32332<br>
AIPS 1: Conv size= 1.40 X 1.40 Position angle= 0.00<br>
AIPS 1: Max ext file #: HI 1 SL 3<br>
AIPS 1: * => NOT the formal reference pixel on this axis<br>
AIPS 1: '483_88_0.008211_-155.8096_113.8049'<br>
<br>
XMOMNC 88<br>
XMOM0 0.0082 guess about 23 microJy<br>
XMOM1 -155 looks about right<br>
XMOM2 113.8 about HWHM^2=125^2, so looks like sqrt(2nd moment)?<br>
<br>
Following is the slice on that row. <br>
<br>
advice welcome. thx. lr<br>
<br>
<br>
<img src="cid:part1.7F340257.D16B7259@umn.edu" alt=""><br>
<br>
following are the inputs to XMOM<br>
AIPS 1: XMOM Finds the moments of each row of an image<br>
AIPS 1: Adverbs Values Comments<br>
AIPS 1:
----------------------------------------------------------------<br>
AIPS 1: INNAME 'A2256SA16C_R' Input image name (name)<br>
AIPS 1: INCLASS 'FAMPRO' Input image name
(class)<br>
AIPS 1: INSEQ 1 Input image name (seq.
#)<br>
AIPS 1: INDISK 5 Input image disk unit #<br>
AIPS 1: OUTNAME ' ' Output image name
(name)<br>
AIPS 1: OUTSEQ 0 Output image name (seq.
#)<br>
AIPS 1: OUTDISK 5 Output image disk unit
#.<br>
AIPS 1: BLC *all 0 Bottom left corner of
input<br>
AIPS 1: TRC *all 0 Top right corner of
input<br>
AIPS 1: FLUX 0 Use only data > FLUX<br>
AIPS 1: ICUT 0 Use only data > in
abs value<br>
AIPS 1: than ICUT (> 0).
Use only<br>
AIPS 1: data < in abs value
than<br>
AIPS 1: ICUT (< 0.).<br>
AIPS 1: OPTYPE ' ' '': blank illegal
velocities<br>
AIPS 1: 'MAX' do max instead of
moms<br>
AIPS 1: PBPARM *all 0 Beam parameters:<br>
AIPS 1: (1) Cutoff: 0 -> no
PB corr<br>
AIPS 1: (2) > 0 -> Use
(3)-(7)<br>
AIPS 1: (3)-(7) Beam shape<br>
AIPS 1: BADDISK *all 0 Disk to avoid for
scratch<br>
<br>
</font>
<pre class="moz-signature" cols="72">--
+++++++++++++++++++++++++++++++++++++
Lawrence Rudnick
Distinguished Teaching Professor
Minnesota Institute for Astrophysics
School of Physics & Astronomy
University of Minnesota
116 Church St. SE
Minneapolis, MN 55455
<a class="moz-txt-link-abbreviated" href="mailto:larry@umn.edu">larry@umn.edu</a> <a class="moz-txt-link-freetext" href="http://umn.edu/~larry">http://umn.edu/~larry</a>
+++++++++++++++++++++++++++++++++++++</pre>
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