abund

Setting

Set the abundance table.

addcomp

Model

Add a component to the model.

addline

Model

Add lines to a model

arf

Data

Read an auxiliary response file.

autosave

Control

Periodically save the XSPEC status.

backgrnd

Data

Reset the files to be used for background subtraction.

chatter

Control

Control the verbosity of XSPEC.

corfile

Data

Reset the files to be used for background correction.

cornorm

Data

Reset the normalization to be used in correcting the background.

cosmo

Setting

Set H₀, q₀, and

cpd

Plot

Alias for setplot device.

data

Data

Input one or more PHA data files.

delcomp

Model

Delete a component from the model.

diagrsp

Data

Diagonalize the current response for an ideal response.

dummyrsp

Model

Create a dummy response, covering a given energy range.

editmod

Model

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

energies

Model

Specify new energy binning for model fluxes.

eqwidth

Model

Calculate a model component’s equivalent width.

error

Fit

Determine a single parameter confidence region.

exec

Control

Execute a shell command from within XSPEC.

exit

Control

Wind up any hardcopy plots and exit from XSPEC.

extend

Model

This is now obsolete.  See energies command.

fakeit

Data

Produce simulated data files for sensitivity studies.

fit

Fit

Find the best fit model parameters.

flux

Model

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

freeze

Fit

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

ftest

Fit

Calculate the F-statistic between two model fits

gain

Model

Perform a simple modification of the response gain.

goodness

Fit

Monte Carlo calculation of goodness-of-fit.

hardcopy

Plot

Spool the current plot to the printer.

help

Control

Obtain help on XSPEC commands.

identify

Model

List possible lines in the specified energy range.

ignore

Data

Ignore a range of PHA channels in future fit operations.

iplot

Plot

As plot command but interactive using PLT.

log

Control

Open the log file to save output.

lumin

Model

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

method

Fit

Set the minimization method.

model

Model

Define the model to be used when fitting the data.

modid

Model

Guess line IDs in the model.

newpar

Model

Modify the model parameters.

notice

Data

Restore a range of PHA channels for future operations.

plot

Plot

Plot various information on the current plot device.

query

Control

Switch on/off prompt to continue fitting.

quit

Control

An alias for exit

renorm

Fit

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

response

Data

Reset the files used to determine the detector responses.

save

Control

Save aspects of the current state to a command file.

script

Control

Open the script file to save all commands input.

setplot

Plot

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

show

Control

Display current file and model information.

source

Control

Execute a script file.

statistic

Fit

Change the fit statistic in use.

steppar

Fit

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

syscall

Control

Run a shell command.

systematic

Model

Set the model systematic error.

tclout

Control

write xspec data to a tcl variable

tcloutr

Control

tclout with return value

thaw

Fit

Allow a model parameter to vary during the fit.

thleqw

Model

Calculates expected fluorescent line equivalent width.

time

Control

Display elapsed time and other statistical information.

uncertain

Fit

Alias for error

untie

Model

Untie linked parameters.

version

Control

Print XSPEC version and build date/time

weight

Fit

Change the weighting function used for chi-squared fits.

xsect

Setting

Change the photoelectric absorption cross-sections in use.

xset

Setting

Modify a number of XSPEC internal switches