atable - Additive table model.
bbody - Blackbody spectrum.
bbodyrad - Blackbody spectrum with norm proportional to surface area.
bknpower - Broken power law.
bremss - Thermal bremsstrahlung.
cflow - Cooling flow model.
compls - Comptonization spectrum after Lamb and Sanford 1979.
compst - Comptonization spectrum after Sunyaev and Titarchuk 1980.
constant - Energy-independent multiplicative factor.
cutoffpl - Power law with high energy exponential cutoff.
cwabs - Photo-electric absorption, including Compton scattering.
cyclabs - Cyclotron absorption line.
disk - Disk model.
diskbb - Multiple blackbody disk model.
diskline - Line emission from relativistic accretion disk.
diskm - Disk model with gas pressure viscosity.
disko - Modified blackbody disk model.
dust - Dust scattering out of the beam.
edge - Absorption edge.
expabs - Low-energy exponential cutoff.
expfac - Exponential factor.
gaussian - Simple gaussian line profile.
highecut - High energy cutoff.
hrefl - Simple reflection model good up to 15 keV.
meka - Mewe-Gronenschild-Kaastra thermal plasma (1992).
mewe - Mewe-Gronenschild thermal plasma (pre-1992).
mkcflw - Cooling flow model based on meka.
mtable - Multiplicative table model.
notch - Notch line absorption.
pcfabs - Partial covering fraction absorption.
pegpwrlw - Power law with pegged normalization.
pliref - Power law illumination of ionized material.
plrefl - Power law illumination of cold material.
powerlaw - Simple photon power law.
raymond - Raymond-Smith thermal plasma.
smedge - Smoothed absorption edge.
spline - Spline multiplicative factor.
SSS_ice - Einstein Observatory SSS ice absorption.
step - Step function convolved with gaussian.
tsabs - Thomson scattering.
useradd1 - The user defined additive model.
usermul1 - User defined multiplicative model.
uvred - UV reddening.
varabs - Photo-electric absorption with variable abundances.
vbremss - Thermal bremsstrahlung spectrum with variable H/He.
vmeka - M-G-K thermal plasma with variable abundances.
vmcflow - Cooling flow model based on vmeka.
vraymond - Raymond-Smith thermal plasma with variable abundances.
wabs - Photo-electric absorption.
wndabs - Photo-electric absorption with low energy window.
zbbody - Redshifted blackbody.
zbremss - Redshifted thermal bremsstrahlung.
zedge - Redshifted absorption edge.
zgauss - Redshifted gaussian.
zhighect - Redshifted high energy cut-off.
zpcfabs - Redshifted partial covering absorption.
zplrefl - Redshifted plrefl model.
zpowerlw - Redshifted power law.
zvarabs - Redshifted photo-electric absorption with variable abundances.
zwabs - Redshifted ``Wisconsin absorption."
zwndabs - Redshifted photo-electric absorption with low energy window.