16.01.01 / jn
The SOURCE command
now resets the offsets set before by the set_default
offsets
command to zero. In order to keep the last given offsets
one
can specify the adverb /KEEPOFFS .
example:
SOURCE
3C273
! reads source from file and clears offsets
SOURCE 3C273
/KEEP
! reads source without changing offsets
The new complete verb with adverbs is:
SOURCE <name> /DEFAULT
/CATALOG_C <cat-name>
/VELOCITY <vel> <frame> /KEEPOFFS
<name>:
source-name in catalog
<cat-name>:
catalog
name
<vel>:
velocity in km/sec or zred
<frame>:
Heliocentric, Barycentric, Local Standard of Rest, Z redshift
The adverb MAPSIZE
used by some verbs like CMAP, CRASTER, PMAP etc. is now able to specify
the direction of the scanning coordinate, i.e. whether one wants to
scan
from positive offsets to negative or viceversa. That is specified
with the sign of the resolution parameter ( <res_lon> and
<res_lat>
) in the two directions.
the new complete adverb is:
SET_DEFAULT MAPSIZE <long> < +/-res_lon>
<lat>
< +/-res_lat> <obs_sys>
<long>:
length in arcsecs for the longitude axis
<res_long>: resolution in longitude in arcsecs, the
sign defines the direction of scanning (for scanned raster only the
sign
is used).
<lat> and <res_lat> define the same values for the
latitude
direction.
<obs_sys>: defines the scanning or raster
coordinate
(LAM,BET,AZM,ELV)
Example for a RASTER:
/mapsize 1000 100 810 90 lam
starts an observation of a region from -500 to +500
arcsecs
in 11 steps along the source longitude with a change in the relative
source
latitude. The latitude begins with an offset of -405 and ends in
9 steps at +405 arcsecs.
/mapsize 1000 100 810 -90 lam
starts an observation of a region from -500 to +500
arcsecs
in 11 steps along the source longitude with a change in the relative
source
latitude. The latitude begins with an offset of +405 and ends in
9 steps at -405 arcsecs.
Never set the resolution to zero. The
value of
<long> or <lat> is treated as a distance, which must be
positive.
More information you can find in the Online
Manual.
