NIC1SCAN

Name

nic1scan

Purpose

Scan for best spectrum location of a weak-signal NICMOS spectrum.

Description

Calling Sequence

nic1scan,obs,dy,nstep

Inputs

obs - anonymous structure containing the NICMOS data. This structure
is initially created by NICINIT.PRO
dy - Delta y, step size for scan.
nstep - number of steps to go away from "center". There will be 2*nsteps+1
trial spectra computed for this.

Optional Input Parameters

Keyword Input Parameters

SLOPE = slope override value to impose on spectral extraction
YPOS = position override value to impose on spectral extraction,
this sets the new "zero-point" or the center of the scan.
PSF - PSF to use for extraction. Can either be an array or a file name.
Default=use last known PSF.

Outputs

Changes are made to some tags of the obs structure:
.coeffn - modified by SLOPE/YPOS and result of scan
.spec - Best spectrum (most flux) found.
.yc - Y location of best spectrum
.xp - new spatial profile
.yp - new spatial profile
.pnp

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Note, this routine does not apply the pixel response function correction.
This means you must make sure all objects are done without the PRF
correction to get a consistent flux value.

Procedure

Modification History

Written by Marc W. Buie, Lowell Observatory, 2001/01/30