To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.
The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.
freeze (and rfreeze)
set parameters as fixed
Do not allow indicated model parameters to vary. (See also thaw)
| Syntax: | freeze | [<param range>...] |
|---|
where <param range> ::= [<modelName>:]<param#>|<param#>- <param#>.
For response parameters (see gain command):
| Syntax: | rfreeze | [<param range>...] |
|---|
where <param range> ::= [<source number>:]<param#>|<param#>- <param#>.
The indicated model parameter or range of model parameters will be marked so they cannot be varied by the fit command. By default,the range will be the last range input by either a freeze or thaw command.
Examples:
Currently there are six parameters, initially all unfrozen.
XSPEC12> freeze 2 //Parameter 2 is frozen XSPEC12> freeze 4-6 //Parameters 4, 5, and 6 are frozen. XSPEC12> thaw 2 3-5 //Parameters 2, 4, and 5 are thawed, parameter 3 is unaffected. XSPEC12> freeze //Parameters 3,4,5 are frozen (the last range input by a freeze //or thaw command). XSPEC12> rfreeze 4-6 //Response parameters 4, 5, and 6 are frozen.