| combine | str | Type of combination to use {average,median,minmax,sigclip} | |
| hsigma | float | High sigma for pixel rejection with sigclip | |
| lambdamax | float | Maximum wavelength to use for flux integration. | |
| lambdamin | float | Minimum wavelength to use for flux integration. | |
| lsigma | float | Low sigma for pixel rejection with sigclip | |
| nhigh | int | Number of maximum pixels to reject with minmax | |
| nifu | int | IFU to handle. If set to 0, all IFUs are processed serially. If set to -1, all IFUs are processed in parallel. | |
| nkeep | int | Number of pixels to keep with minmax | |
| nlow | int | Number of minimum pixels to reject with minmax | |
| normalize | int | Normalize the master skyflat to the flux integrated over the given wavelength range. | |
| overscan | str | If this is "none", stop when detecting discrepant overscan levels (see ovscsigma), for "offset" it assumes that the mean overscan level represents the real offset in the bias levels of the exposures involved, and adjusts the data accordingly; for "vpoly", a polynomial is fit to the vertical overscan and subtracted from the whole quadrant. | |
| ovscignore | int | The number of pixels of the overscan adjacent to the data region of the CCD that are ignored when computing statistics or fits. | |
| ovscreject | str | This influences how values are rejected when computing overscan statistics. Either no rejection at all ("none"), rejection using the DCR algorithm ("dcr"), or rejection using an iterative constant fit ("fit"). | |
| ovscsigma | float | If the deviation of mean overscan levels between a raw input image and the reference image is higher than |ovscsigma x stdev|, stop the processing. If overscan="vpoly", this is used as sigma rejection level for the iterative polynomial fit. Has no effect for overscan="offset". | |
| recipe_version | int | Version of the recipe | |
| scale | int | Scale the individual images to a common exposure time before combining them. | |
