[daip] aips question regarding BLANKING and MCUBE

[Cornelia C Lang]

Hi folks,

I would like to CONVL a cube of ~12 planes (part of an RM project).
Right now I am running into CONVL complaining that it can not
convolve images that are blanked. However, upon inspection of the
12 planes, none of them seem to be blanked, and in fact, I can
run CONVL on each of them individually. Is it possible that when
MCUBE runs it inserts a line about Magic Value Blanking into the
header of its output. Here's the MCUBE header I'd like to convolve:

AIPS 4: Image=C1SNAK3   (MA)         Filename=SNAK3       .MCUBE .   1
AIPS 4: Telescope=VLA                Receiver=VLA
AIPS 4: Observer=AL552               User #= 1977
AIPS 4: Observ. date=07-OCT-2001     Map date=09-NOV-2001
AIPS 4: Pixel type: FLOATING         Magic value blanking
AIPS 4: Minimum=-9.00000763E+01      Maximum= 4.13114141E+04 DEGREES
AIPS 4: ----------------------------------------------------------------
AIPS 4: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 4: RA---SIN   512    17 44 15.000     256.00         -3.000    0.00
AIPS 4: DEC--SIN   512   -29 46 00.000     257.00          3.000    0.00
AIPS 4: LANG        12   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 4: STOKES       1   7.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 4: ----------------------------------------------------------------
AIPS 4: Coordinate equinox 2000.00
AIPS 4: Map type=NORMAL              Number of iterations=     372
AIPS 4: Conv size=  15.00 X  14.00   Position angle=   0.00
AIPS 4: Rest freq      0.000         Vel type: OPTICAL wrt YOU
AIPS 4: Alt ref. value  0.00000E+00  wrt pixel    1.00
AIPS 4: Maximum version number of extension files of type HI is   1

The only line that appears to be different is this one:

AIPS 4: Pixel type: FLOATING         Magic value blanking

Is there a way (using puthead or axdef) to get ride of this magic
value blanking? Or is there some other problem with trying to run
CONVL on a MCUBE output?

Many thanks,
Cornelia

-- 
Cornelia C. Lang, Assistant Professor
Dept. of Physics & Astronomy, 703 Van Allen Hall
University of Iowa, Iowa City IA 52242
phone 319.335.1945, fax 319.335.1753
email: cornelia-lang at uiowa.edu
http://phobos.physics.uiowa.edu/~clang