make_bias

ndmapper.lib.gmos.make_bias(*args, **kwargs)

Combine individual bias exposures to produce a reference bias frame for calibrating other data.

Parameters:

inputs : DataFileList

Input raw bias images.

bias : str-like, optional

Output combined bias image name. If None (default), a new DataFile will be returned whose name is constructed from that of the first input file, by appending ‘_bias’.

bpm : DataFile or DataFileList, optional

A bad pixel mask, used if ‘use_uncert’ and/or ‘use_flags’ is enabled. This can be created with the Gemini IRAF task GBPM.

ovs_function : str

Function to use for fitting the overscan region in IRAF (default ‘chebyshev’; may also be ‘legendre’, ‘spline1’ or ‘spline3’).

ovs_order : int

Order of the overscan fitting function (default 1).

ovs_lsigma : float

Negative sigma rejection threshold for overscan fitting (default 2.0).

ovs_hsigma : float

Positive sigma rejection threshold for overscan fitting (default 2.0).

ovs_niter : int

Number of rejection iterations for overscan fitting (default 5).

comb_lsigma : float

Negative sigma rejection threshold for averaging biases (default 2.0).

comb_hsigma : float

Positive sigma rejection threshold for averaging biases (default 2.0).

interact : bool, None

Fit the overscan region interactively in IRAF? If None (default), interactivity is instead controlled by the package configuration dictionary (see below).

See “help gbias” in IRAF for more detailed information.

Returns:

outbias : DataFile

The combined bias image produced by gbias.