dewiggle

Synopsis

Straighten LETG/HRC-S spectra by applying tg_d adjustments.

Syntax

dewiggle infile outfile

Description

dewiggle reads in a standard LETG/HRC-S evt2 file and adjusts the TG_D values of all events to remove small "wiggles" and straighten the dispersed spectrum. The adjustments, which are up to +/-1.5 HRC pixels, are applied on a tap-by-tap (CRSV) basis along the dispersion axis and correct small residual errors that cannot be corrected by the HRC-S degapping procedure. Only TG_D values are affected; the output file will not exhibit any changes if displayed in sky or detector coordinates.

dewiggle is generally used in combination with the detilt and symmetrize commands--also contributed software tools--to prepare LETG/HRC-S spectra so that narrower spectral extraction regions can be used to improve the S/N of low-S/N data.

Example

dewiggle input_evt2.fits output_evt2.fits clobber+

Run the program with the clobber parameter enabled.

Parameters

name	type	ftype	def	min	max	reqd	stacks
infile	file					yes	no
outfile	file	output				yes	no
wfile	file		${ASCDS_CONTRIB}/data/wigglecorrection.dat				no
verbose	integer		0	0	5
clobber	boolean		no

Detailed Parameter Descriptions

Parameter=infile (file required stacks=no)

Input FITS file event list with columns CHIP_ID, CHIPY and TG_D.

Parameter=outfile (file required filetype=output default= stacks=no)

Output FITS file event list with modified TG_D column.

Parameter=wfile (file default=${ASCDS_CONTRIB}/data/wigglecorrection.dat stacks=no)

Wiggle correction file, containing TG_D correction as a function of CRSV.

Parameter=verbose (integer default=0 min=0 max=5)

Tool chatter level

Controls the amount of information tool prints to the screen.

Parameter=clobber (boolean default=no)

Remove outfile if it already exists?

About Contributed Software

This tool is not an official part of the CIAO release but is made available as "contributed" software via the CIAO scripts page. Please see this page for installation instructions.

Bugs

There are no known bugs for this tool.