The Defaults File

This file (at present called twodspec_defaults.sdf) is used to allow the behaviour of programs to be varied. The elements have the following meanings:

FIT_HANDLER

If this has the value 1 then a condition handler is used during the fitting (this is in addition to the FIGARO default handler). This condition handler is not available with the Sun version.

OPT_STEP

This controls the size of jump between iterations in the fitting. The value multiplies the default.

TOLS

These are the values copied to the TOLS array in the results structure when a new results structure is created. Where appropriate the values will be multiplied by the dispersion.

USEPEAK

If this is 1 then the single component fitting will default to taking the peak as the centre, for guessing.

VACUUM

This is set to 1 to indicate wavelengths are values in vacuum.

AX1_LOG

If this is 1 it indicates that the first axis has a log scale (by default).

AX1_UNITS

The default units for the first axis.

RELATIVISTIC

Type integer, if absent, or of value 1, then a full relativistic furmula is used for Doppler shifts, otherwise the non-relativistic one is used.

DEC

FITS keywords to search to find declination of object (not yet used)

COR_DEC

Mutiplier for values from DEC to convert to degrees (not yet used)

RA

FITS keywords to search to find right ascension of object (not yet used)

COR_RA

Mutiplier for values from RA to convert to hours (not yet used)

EQUINOX

FITS keywords to search to find equinox

UT

FITS keywords to search to find UT

TELESCOP

FITS keywords to search to find telescope name (in form acceptable to SLALIB)

LONG_OBS

FITS keywords to search to find longitude of observatory

COR_LONG_OBS

Mutiplier for values from LONG_OBS to convert to degrees

LAT_OBS

FITS keywords to search to find latitude of observatory

COR_LAT_OBS

Mutiplier for values from LAT_OBS to convert to degrees

If the multipliers are absent they are taken as 1.0.

An example of a defaults file is given below (as shown by Figaro exam):

twodspec_defaults   Struct
  .FIT_HANDLER   Int     0
  .OPT_STEP      Float   1
  .TOLS[13]      Float   0.10000 3 -3 0.2000 8 1 5 1000 20 5 2.000E-3
                                                      .... 2.000E-3 3
  .USEPEAK       Int     1
  .VACUUM        Int     0
  .AX1_LOG       Int     0
  .AX1_UNITS[20]  Char   Angtroms
  .Z             Struct
    .DATA[1]     Float   0
  .COR_LAT_OBS[1]  Float 1
  .LAT_OBS[8,1]  Char    LAT_OBS
  .LONG_OBS[8,1]  Char   LONG_OBS
  .COR_LONG_OBS[1]  Float -1

In this case COR_LONG_OBS is used to correct for the value of longitude in the file's being positive east, whereas we want positive west. Note that you can have several values in each array, which would act as a search list (at present up to 5 values).