Description¶
- Class:
jwst.ami.AmiNormalizeStep
- Alias:
ami_normalize
The ami_normalize
step is one of the AMI-specific steps in the ami
sub-package and is used in Stage 3 calwebb_ami3
processing. It provides normalization of LG processing results for
a science target using LG results of a reference PSF target. The algorithm
subtracts the PSF target closure phases from the science target closure
phases and divides the science target fringe amplitudes by the PSF target
fringe amplitudes.
Arguments¶
The ami_normalize
step does not have any step-specific arguments.
Inputs¶
LG model parameters¶
- Data model:
- File suffix:
_amiavg and _psf-amiavg
The ami_normalize
step takes two inputs: the first is the LG results for
a science target and the second is the LG results for the PSF target. These should
be the “_amiavg” and “_psf-amiavg” products resulting from the
ami_average step. The inputs can be in the form of file
names or AmiLgModel
data models.
Outputs¶
Normalized LG model parameters¶
- Data model:
- File suffix:
_aminorm
The output is a new LG product for the science target in which the closure phases and fringe amplitudes have been normalized using the PSF target closure phases and fringe amplitudes. The remaining components of the science target data model are left unchanged. The output file name syntax is source-based, using the product name specified in the input ASN file and having a product type of “_aminorm”, e.g. “jw87600-a3001_t001_niriss_f480m-nrm_aminorm.fits.”
Reference Files¶
The ami_normalize
step does not use any reference files.