Summary of Commands

abund

Set the abundance table.

addcomp

Add a component to the model.

addline

Add lines to a model (Tcl script).

arf

Read an auxiliary response file.

autosave

Periodically save the XSPEC status.

backgrnd

Reset the files to be used for background subtraction.

bayes

Set up for Bayesian inference

chain

Run a Monte Carlo Markov Chain.

chatter

Control the verbosity of XSPEC.

corfile

Reset the files to be used for background correction.

cornorm

Reset the normalization to be used in correcting the background.

cosmo

Set H0, q0, and Lambda0.

cpd

Alias for setplot device.

data

Input one or more PHA data files.

delcomp

Delete a component from the model.

diagrsp

Diagonalize the current response for an ideal response.

dummyrsp

Create a 'dummy' response, covering a given energy range.

dump

Write out history packages of the observed spectrum and model.

editmod

Add, delete, or replace one component in the model.

eqwidth

Calculate a model component's equivalent width.

error

Determine a single parameter confidence region.

exec

Execute a shell command from within XSPEC.

exit

Wind up any hardcopy plots and exit from XSPEC.

extend

Extend the energy range over which the model is calculated.

fakeit

Produce simulated data files for sensitivity studies.

fit

Find the best fit model parameters.

flux

Calculate the current model's flux over an energy range.

freeze

Do not allow a model parameter to vary during the fit.

ftest

Calculate the F-statistic between two model fits

gain

Perform a simple modification of the response gain.

genetic

Set parameters for genetic fitting method.

goodness

Monte Carlo calculation of goodness-of-fit.

hardcopy

Spool the current plot to the printer.

help

Obtain help on XSPEC commands.

identify

List possible lines in the specified energy range.

ignore

Ignore a range of PHA channels in future fit operations.

improve

Try to find a better minimum (requires MINUIT).

iplot

As plot command but interactive using PLT.

log

Open the log file to save output.

lumin

Calculate the current model's luminosity over a given rest frame energy range and redshift.

mdefine

Create a new model component defined by an algebraic expression.

method

Set the minimization method.

model

Define the model to be used when fitting the data.

modid

Guess line IDs in the model (Tcl script).

newpar

Modify the model parameters.

notice

Restore a range of PHA channels for future operations.

plot

Plot various information on the current plot device.

query

Switch on/off prompt to continue fitting.

quit

An alias for exit.

readline

Enable/disable the gnu readline facility.

recornrm

Adjust correction norms to minimize the fit statistic, holding the model fixed.

renorm

Adjust the model norms, and/or allow automatic renorming.

response

Reset the files used to determine the detector responses.

save

Save aspects of the current state to a command file.

script

Open the script file to save all commands input.

setplot

Modify the plot device and other values used by the plot routines.

show

Display current file and model information.

source

Execute a script file.

statistic

Change the fit statistic in use.

steppar

Step through a range of parameter values; perform a fit at each step.

suggest

Make a suggestion or report a bug to the XSPEC gnomes.

syscall

Run a shell command.

systematic

Set the model systematic error.

tclout

write xspec data to tcl variable $xspec_tclout

thaw

Allow a model parameter to vary during the fit.

thleqw

Calculates expected fluorescent line equivalent width.

time

Display elapsed time and other statistical information.

uncertain

Alias for error.

untie

Untie linked parameters.

weight

Change the weighting function used for chi-squared fits.

xhistory

Open a history file, in order to save fit results.

xsect

Change the photoelectric absorption cross-sections in use.

xset

Modify a number of XSPEC internal switches