XMM-Newton Science Analysis System
oal (oal-3.92) [xmmsas_20030110_1802-5.4.1]
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The OAL provides functionality to expand a pair of two or a tuple of four
identifiers
into a valid ODF data set name which can then be used to physically open
the set, e.g. with the dal
open method.
The corresponding OAL routine receives a string which is either a
valid data set name or of the form
odf(<instr>, <mode>[, <expnr>, <ccdnr>[, scheduledFlag]])
or
oal(<instr>, <mode>[, <expnr>, <ccdnr>[, scheduledFlag]])
The four fields have the following meaning:
- <instr>:
- a string which must uniquely identify an
instrument. The following table lists the possible values:
| identifier |
meaning |
| XMM |
selects satellite specific data sets or sets for which
the instrument field is not applicable |
| XRT1/XRT2/XRT3 |
the mirror systems 1, 2, (in front
of EMOS1/RGS1 and EMOS2/RGS2), and 3
(in front of EPN) |
| EMOS1/EMOS2 |
EPIC MOS camera units 1 and 2 |
| EPN |
EPIC PN camera unit |
| ERM |
EPIC Radiation Monitor |
| RGS1/RGS2 |
units 1 and 2 of the RGS |
| OM |
the optical monitor |
- <mode>:
- a string which must uniquely identify a data mode; see
Appendix A for a list of allowed
values
- <expnr>:
- a numeric value identifying an exposure number
within the current observation period; must be set to 0 if not applicable
- <ccdnr>:
- a numeric value specifying a CCD chip of
the selected instrument. CCD numbers are in the range
1-7 for EMOS1/EMOS2, 1-12 for EPN, and
1-9 for RGS1/RGS2; the numbering follows that
used in the cal. For OM this is the
science window identifier.
Example: 1 for EMOS1 specifies the central chip on EMOS camera 1
and 12 for EPN the bottom right chip of the EPN camera as viewed
from the mirror platform through the telescope tube onto the focal plane.
For data sets for which the field is not applicable a value of 0 must be given.
If neither expnr nor ccdnr are applicable as this is the
case for some files in the satellite scope, the form
odf(<instr>, <mode>)
can be used in lieu of the above full form.
Example: odf(XMM, Attitude) refers to the Attitude History
File a single instance of which applies to the the entire observation period
the current ODF covers.
- <scheduledFlag>:
- the letter 'S' or 'U' for
Scheduled/Unscheduled; the field is optional, if omitted no check for
the scheduled status of the exposure will be done.
For the two non-numeric fields <instr> and <mode>
abbreviations can be used to designate a wanted value,
e.g. Im, or Ima, Image are all
valid reference to `Imaging Mode'. If an abbreviated string value
cannot be unambiguously expanded into its full form a fatal error condition
is raised. Case is insignificant for both fields.
The ODF file name completion needs access to the Summary File
of the ODF in question. Therefore, the name of the directory
containing an ODF must be specified by the user, either in the
form of a proper task parameter or in an environment variable.
See below for details.
XMM-Newton SOC/SSC -- 2003-01-10