ESO
SINFONI Pipeline User Manual
Doc:
VLT-MAN-ESO-19500-3600
Issue:
Issue 1.0
Date:
Date 2005-10-19
Page:
30 of 88
5
Known problems
We suggest the user to execute the data reduction recipes using parameter defaults and all the reference and
master calibrations indicated in this manual. The following is a list of currently-known issues with SINFONI
recipes, and workarounds, if available:
si_rec_wavecal This recipe sometimes fails to determine the positions of the slitlets. A possible reason is an
improper data reduction parameter setting. For example the parameter wcal-pixel_tol has a default value
of 3.0 to insure good accuracy. Values equal to 5 or 6 may insure higher robustness at the price of a minor
accuracy.
The same is true for the parameters having aliases wcal-min_diff, wcal-na_coeffs, wcal-nb_coeffs, wcal-
pix_tol, wcal-y_box, which in the current release, for accuracy, have default values as specified in the
first column of the following table but in previous releases they had default values as specified in the other
table rows, values which might offer greater robustness at a price of a minor accuracy.
band
wcal-min_diff
wcal-na_coeffs
wcal-nb_coeffs
wcal-pix_tol
wcal-y_box
comment
any
1.0
4
2
3.0
5.0
default setting
H
10.0
3
2
7.0
2.0
old setting
H+K
1.0
4
2
5.5
5.0
old setting
K
1.0
4
2
12.0
5.0
old setting
J
1.0
4
2
3.0
5.0
old setting
Another possible explanation of the failure is the usage of an improper bad pixel map. We suggest to
use the REF_BP_MAP, provided with the present kit release, as input of the si_rec_mflat recipe which
determines the MASTER_BP_MAP, which is input of the si_ref_wavecal recipe.
si_rec_objnod This recipe is much demanding in term of RAM. The amount of RAM required is approxima-
tively given by the formula:
RAM=
!
MB,
where
"
,
"
,
indicate the size of the coadded cube and
#
is the number of coadded cubes.
"
and
are a function of the minimum and maximum x and y offsets of the coadded cube components
with respect to the first one:
" %$
&('*),++-.,+/'0'21
354
+/'0'21
7698
;:
!
"<$
='*),++-.,+'0'2>
354
+/'0'2>
5698
;:
!
The
'*),++-.?1
!
function computes the largest integral value not greater than
1
. We suggest the user to have
at least 1GB of RAM and a swap area at least equal to the amount of RAM. In case,
" @$A$
,
B$
,
C7
$
, the user needs at least 1.6 GB of RAM, the same amount of swap, dedicated
to run the pipeline. We also suggest the user to check before starting the data reduction the values of
keywords SEQ CUMOFFSETX and SEQ CUMOFFSETY. Sometimes those may be very different. This
may be such that the size of the output coadded cube is large enough not to allow a full data reduction,
due to the limited amount of available RAM.
In those cases, or if the single cube components correspond to observations of portions of the sky which
do not overlap with each other, we suggest the user to set objnod-jit_ind=FALSE.
si_rec_objnod WCS coordinates in the coadded cube may be imprecise. WCS coordinates are based on the
values of the FITS keywords RA and DEC. More accurate values are indeed given by INS TARG ALFA
and INS TARG DELTA, but sometimes those are wrong. The WCS coordinates refer to the position of
the first object of the list in the coadded space, which may not be at the center of the FOV.
