| cliphigh | float | Fraction of points to clip at high end | | |
| cliplow | float | Fraction of points to clip at low end | | |
| dangmax | float | Maximum change in position angle per iteration | | |
| debug | int | Debug verbosity parameter | | |
| dellmax | float | Maximum change in ellipticity per iteration | | |
| dposmax | float | Maximum change in center per iteration | | |
| errcen | float | Used when rcen=0. The maximum radius for which err(1nd har) < errcen is used as the maximum radius for changing the centers | | |
| errshap | float | Used when rshap=0. The maximum radius for which err(2nd har) < errshap is used as the maximum radius for fitting. | | |
| extend | int | Extend radial interval after fit | | |
| fracmin | float | Minimum fraction of good points along the ellipse | | |
| hmax | int | Maximum order of the harmonics term residuals | | |
| iter1 | int | Number of iterations without calculating model-residuals | | |
| iter2 | int | Number of iterations including calculating model-residuals | | |
| linear | int | Linear scaling switch | | |
| mask_areas | GalPhotMask | List of GalPhotCircle and/or GalPhotRectangle objects, which define areas to be masked | | |
| mask_scale | float | Scale factor to apply to semi-major axis of neighbours while masking | | |
| mask_type | str | Switch to use Sourcelist ("sourcelist"), Segmentation image ("segmentation") or neither ("") for masking neighbours | | |
| ngal | int | Number of galaxies to model, fixed to 1 | | |
| npolres | int | Order in interpolation in intensity | | |
| nsammax | int | Maximum number of samples along the ellipse | | |
| outfill | int | Calculate residual outside of galaxy | | |
| r1 | float | Maximum radius for single annulus sampling | pixel | |
| r2 | float | Maximum radius for multiple annulus sampling | pixel | |
| radfac | float | Radial scaling factor | | |
| rcen | float | All ellipses with r > rcen have their centers fixed | pixel | |
| region_scale | float | Factor which determines the size of the region, as a function of the source Sextractor parameter Reff | | |
| region_xmax | int | Maximum x-coordinate of cutout region in larger frame | pixel | |
| region_xmin | int | Minimum x-coordinate of cutout region in larger frame | pixel | |
| region_ymax | int | Maximum y-coordinate of cutout region in larger frame | pixel | |
| region_ymin | int | Minimum y-coordinate of cutout region in larger frame | pixel | |
| rmax | float | Maximum radius for fit. rmax=0 means fit until ellipses drop completely off the image | pixel | |
| rmin | float | Minimum radius for fit | pixel | |
| rshap | float | Maximum radius for modifying ellipticity and PA | pixel | |
| xpos | float | X-position (in region) of galaxy to model | pixel | |
| ypos | float | Y-position (in region) of galaxy to model | pixel | |
