A simple PICARD recipe combine SCUBA-2 or ACSIS images taking into account the EXP_TIME NDF component. Default behaviour is to combine all images into a single coadd/mosaic. However this can be overridden using the MOSAIC_EACH recipe parameter which will combine images based on the OBJECT in the FITS header.

Creates one or more output files with suffix _mos, using the name of the last file in the list as its base.

• When combining all given images (default behaviour), the user should check that their positions do not differ by a large amount. The concept of large may depend on the input images (especially for 450 um SCUBA-2 data) and how much they fill in the region between the extreme positions.

• Creating an image spanning 10-20 degrees will probably result in images many GB in size unless the pixel scale is enlarged.

• For SCUBA-2 images the WEIGHTS and NEFD NDF components are also dealt with (if present).

• If the input data are uncalibrated, it is recommended that they be calibrated before mosaicking (calibrating the coadd/mosaic may not be reliable).

The following parameters can be set via the -recpars option:

MOSAIC_EACH

MOSAIC_TASK

MAKEMOS_METHOD

MAKEMOS_SIGMAS

MASK_LOWVAR

WCSMOSAIC_METHOD

WCSMOSAIC_PARAMS

None.