Recipes

Data reduction recipes exist for processing data from the standard SCUBA observing modes. This does limit the flexibility of any given recipe since they are designed to work for any data from that mode. Occasionally it is necessary to modify recipes (e.g. change the sky bolometers or size of pixels to be used for the rebinning) and this can be achieved in a number of ways:

1.

Specify a new recipe name on the command line. This is fine for reducing observations taken in the same way but should not be used in the general case since this command line argument overrides all recipe choices regardless of observation mode.

2.

Create a recipe with a different name and store this name in the header before the observation is taken. This is done by using the DRRECIPE ODF parameter.

3.

Create a recipe with a different name and modify the DRRECIPE FITS header value using the KAPPA fitsmod command.

4.

Use the ORAC_RECIPE_DIR environment variable. This variable should be set before running up ORAC-DR and provides a search path that is used to locate recipes. When ORAC-DR attempts to read a recipe it first looks in ORAC_RECIPE_DIR, then in ORAC_DIR/recipes/SCUBA (the default location) and finally in the current directory (which will be ORAC_DATA_OUT).

In order to modify a recipe, it should be copied from the default location (ORAC_DIR/recipes/SCUBA) to ORAC_RECIPE_DIR and edited there. The next time ORAC-DR tries to read the recipe the modified version will be used in preference to the standard version.

The standard SCUBA recipes are:

SCUBA_NOISE

for noise observations

SCUBA_STD_PHOTOM

for photometry observations

SCUBA_JIGMAP

for jiggle map reduction

SCUBA_POINTING

for array pointing observations

SCUBA_EM2SCAN

for SCAN/MAP data reduction using the Emerson II technique [2].

SCUBA_SKYDIP

for skydip observations.

SCUBA_JIGPOLMAP

for array polarimetry (jiggle maps)

SCUBA_EKHSCAN

for scan/map data reduction using the EKH [3] technique

Null recipes are provided for ALIGN, and FOCUS observations.