process_extension

sofia_redux.instruments.fifi_ls.fit_ramps.process_extension(hdu, readout_range, threshold=5, s2n=10, remove_first=None, subtract_bias=True, badmask=None, average_ramps=True, posdata=None, indpos_sigma=3.0)

Wrapper to process a single HDU extension.

Parameters:

hduImageHDU

input HDU extension

readout_rangearray_like of int

(start readout, ramplength)

thresholdfloat, optional

Robust rejection threshold (in sigma) for combining slopes of individual ramps.

s2nfloat, optional

Signal-to-noise below which data will be considered questionable and will be ignored. Set <= 0 to turn off signal-to-noise filtering.

remove_firstbool, optional

if True, remove the first two ramps prior to fitting

subtract_biasbool, optional

If True, subtract the value of the empty zeroth pixel for each spaxel prior to fitting.

badmasknumpy.ndarray, optional

(npoints, (spexel, spaxel)) array specifying indices of bad pixels

average_rampsbool, optional

If set, data is averaged over ramps (default). If not, all ramps are returned, as appropriate for OTF mode data, for which each ramp is at a different sky position.

posdatafits.Table, optional

OTF scan position data table. If provided and average_ramps is set to False, then the input DLAM_MAP and DBET_MAP for each readout are averaged over each ramp; the FLAG key is and-ed over the ramp. The UNIXTIME for the first and last retained ramps are averaged and added to the header as RAMPSTRT and RAMPEND keywords, respectively.

indpos_sigmafloat, optional

If >0, will be used to discard samples with grating position that deviates from the expected INDPOS value by this many sigma.

Returns:

flux, stddevImageHDU, ImageHDU

Optionally, a third element may be returned: a BinTableHDU containing OTF position data, propagated from the posdata argument.