An attribute for controlling the number of parallel processes in use during various XSPEC contexts.
Examples:
# Use up to 4 parallel processes during# Levenberg-Marquardt fitting. Xset.parallel.leven = 4# Use up to 4 parallel processes during# Fit.error() command runs.Xset.parallel.error = 4# Other available contexts are:# Xset.parallel.steppar, walkers, and goodness.# Display current settings of all parallel contexts.Xset.parallel.show()# Reset all contexts to single process usage.Xset.parallel.reset()