| bkgfraction | float | Fraction of the image (without the ignored part) to be considered as background. | |
| bkgignore | float | Fraction of the image to be ignored. | |
| bpixdistance | float | Minimum allowed distance of a source to the closest bad pixel in pixel. Detected sources which are closer to a bad pixel are not taken into account when computing the field offsets. This option has no effect if the source positions are taken from input catalogs. | |
| expmap | int | Enables the creation of a simple exposure map for the combined field-of-view. | |
| fwhm | float | FWHM in pixels of the convolution filter. | |
| iterations | int | Maximum number of iterations used for detecting sources. | |
| nbins | int | Number of bins to use for 2D histogram on the first iteration of the offset computation. | |
| override_detection | int | Overrides the source detection step. If this is enabled and source catalogs are present in the input data set, the source positions used to calculate the field offsets are read from the input catalogs. If no catalogs are available as input data the source positions are detected on the input images. | |
| recipe_version | int | Version of the recipe | |
| roundmax | float | Upper limit of the allowed point-source roundness. | |
| roundmin | float | Lower limit of the allowed point-source roundness. | |
| rsearch | str | Search radius (in arcsec) for each iteration of the offset computation. | |
| sharpmax | float | Upper limit of the allowed point-source sharpness. | |
| sharpmin | float | Lower limit of the allowed point-source sharpness. | |
| srcmax | int | Maximum number of sources which may be found. | |
| srcmin | int | Minimum number of sources which must be found. | |
| step | float | Increment/decrement of the threshold value in subsequent iterations. | |
| threshold | float | Initial intensity threshold for detecting point sources. If the value is negative or zero the threshold is taken as sigma above median background MAD. If it is larger than zero the threshold is taken as absolute background level. | |
| weight | int | Use weighting. | |
