Steering primitive

Within a recipe's _HELLO primitive, a `steering' primitive is invoked. These are best left well alone. They control when the various operations are performed. See steering headers for more details. What you can safely adjust are the configurable steering parameters listed in the recipe documentation. In the main these parameters set the number of frames processed in a cycle through the recipe. The parameters are passed by argument through the recipe's _HELLO script to the steering primitive.

Suppose that for some reason an observation of a nine-point jitter self flat was aborted after seven positions. If you try the recipe stored in the headers some processing will occur, but it will not include mosaic creation. The final steps inclusing mosaic creation occur once all nine frames are dark subtracted. Now there are no seven-point recipes to substitute on the command line. You could make your own seven-point recipe to reduce those data. First make a new recipe by copying the standard one.

 % cd $ORAC_RECIPE_DIR
 % cp $ORAC_DIR/recipes/imaging/JITTER_SELF_FLAT ./JITTER7_SELF_FLAT

Next edit JITTER7_SELF_FLAT and alter the line

      _JITTER_SELF_FLAT_HELLO_

to become

      _JITTER_SELF_FLAT_HELLO_ NUMBER=7

The recipe will then generate the self flat, flat field and make the mosaic once the seventh frame is dark-subtracted.

Recipes are stored in $ORAC_DIR/recipes/imaging; and for a few instrument-specific recipes in $ORAC_DIR/recipes/<instrument>, where <instrument> is IRCAM, MICHELLE, UFTI. IRIS2, ISAAC, or INGRID. See the notes for some details.