The FEROS Data Reduction System (DRS) is implemented within ESO-MIDAS.
It consists of a MIDAS context (feros) and a
of "local" procedures which can be copied from the MIDAS
distribution to the user's midwork directory in order to use them.
Alternatively the following archive can be used to set up a FEROS DRS
environment identical to the one provided at the telescope. A few
additional shell scripts and utilities are provided to make life easy,
see the README:
The above package has been tested on MIDAS versions
01FEBpl1.0 & 02FEBpl1.0. In principle it should be compatible with
all versions later than these, and will probably be compatible
with versions back to 98NOV.
The DRS page for FEROS at the ESO-1.52m can be found here.
File Naming conventions
File naming conventions for DRS products are given
here and in Appendix 1 of the FEROS-DRS
From time to time, if for any reason certain of the FEROS components
shift (e.g. earthquakes, total disassembly and reassembly to move from
one telescope to another, etc) the cross order profile suffers a
significant change (see here)
such that the initial guess for the orders is no longer sufficiently
accurate. For each shift a new Initial Guess session should be
created/used. Here are guess sessions appropriate for various epochs
during the life of FEROS...
At the MPG/ESO-2.20m
2005-10 --: The same Guess Sessions can be used for all
readout modes of a given binning, but the different binnings require
different Guess Sessions:
The principal purpose of the FEROS DRS is to provide an online,
real-time reduction of the observations as they are acquired at the
telescope. Various simplifying assumptions are made and as a result,
these reductions, or DRS products, are intended only as a "quick
look tool". They are not intended to be of Publication
Quality. More to the point ESO definitely does NOT guarantee
them to be of publication quality. They can be used to check
approximate Signal to Noise level and simple things like that.
Offline Reductions at home
The FEROS DRS can none the less be used to obtain Publication Quality
reductions. In particular close attention should be paid to the
Order location and order tracing.
Compare calibrations obtained during the afternoon before the
observations with those acquired in the morning after for drifts in
order location or changes in the wavelength solution.