Modify a number of XSPEC internal switches.
Syntax: xset [abund |cosmo |delta | mdatadir |method |seed |statistic |weight | xsect |<string_name>] [ <options>|<string_value>]
The arguments abund, cosmo, method, statistic, weight, and xsect just run the appropriate XSPEC commands. mdatadir changes the directory in which XSPEC searches for model data files. You probably don't want to change this. The seed option requires an integer argument, which will then be used to immediately re-seed and re-initialize XSPEC's random-number generator.
The delta option is for setting fit delta values (see the newpar command) which are proportional to the current parameter value rather than fixed. For example,
XSPEC12> xset delta .15will set each parameter fit delta to .15 * parVal. To turn proportional deltas off and restore the original fixed deltas, set delta to a negative value or 0.0. The current proportional delta setting can be seen with show control.
The <string_name> option can be used to pass string values to models. XSPEC maintains a database of <string_name>, <string_value> pairs created using this command. Individual model functions can then access this database. Note that xset does no checking on whether the <string_name> is used by any model so spelling errors will not be trapped.
To access the <string_name>, <string_value> database from within a model function use the fortran function fgmstr. This is defined as character*128 and takes a single argument, the string name as a character*128. If the <string_name> has not been set then a blank string will be returned.
The current <string_name> options, models to which they apply and brief descriptions are given in the following table :
| APECROOT | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)mekal, mkcflow, nlapec, t(v)(v)apec, vmcflow | Switch from default APEC input files. |
| APECTHERMAL | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Thermally broaden emission lines in APEC input files. |
| APECVELOCITY | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Velocity broaden emission lines in APEC input files. |
| APECMINFLUX | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Set minimum flux for line broadening. |
| APECBROADPSEUDO | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Broaden pseudo-continuum lines. |
| APECNOLINES | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Continuum only. |
| APEC_TRACE_ABUND | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Set trace element abundances. |
| APECLOGINTERP | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)equil, (v)mekal, mkcflow, nlapec, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov, t(v)(v)apec, vmcflow | Use logarithmic interpolation between tabulated temperatures. |
| APECUSENEI | (v)(v)apec, b(v)(v)apec, b(v)(v)tapec, c6(v)mekl, c6p(v)mekl, ce(v)mkl, (v)mekal, mkcflow, nlapec, t(v)(v)apec, vmcflow | Use NEI code to calculate CEI spectra. |
| NEIAPECROOT | (v)equil, (v)gnei, (v)nei, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov | Switch from default NEIAPEC input files. |
| NEIVERS | (v)equil, (v)gnei, (v)nei, (v)npshock, (v)pshock, (v)(v)rnei, (v)sedov | Set version of NEI calculations. |
| POW_EMIN, POW_EMAX | powerlaw, bknpower, bkn2pow, cutoffpl | Switch to normalize to a flux calculated over an energy range. |
| NEIVERS | gnei, nei, vgnei, vnei, equil, vequil, npshock, vnpshock, pshock, vpshock, sedov, vsedov | Switch NEIAPEC version number. |
| CFLOW_VERSION | mkcflow, vmclow | Switch CFLOW version number. |
| CFLOW_NTEMPS | mkcflow, vmclow | Switch number of temperature bins used in CFLOW model. |
| SUZPSF-IMAGE | suzpsf | Set image file to be used for surface brightness. |
| SUZPSF-RA | suzpsf | Set RA for center surface brightness map which is taken from the WMAP. |
| SUZPSF-DEC | suzpsf | Set Dec for center surface brightness map which is taken from the WMAP. |
| SUZPSF-MIXFACT-IFILE# | suzpsf | Set filename to read mixing factors. |
| SUZSF-MIXFACT-OFILE# | suzpsf | Set filename to write mixing factors. |
| XMMPSF-IMAGE | xmmpsf | Set image file to be used for surface brightness. |
| XMMPSF-RA | xmmpsf | Set RA for center surface brightness map which is taken from the WMAP. |
| XMMPSF-DEC | xmmpsf | Set Dec for center surface brightness map which is taken from the WMAP. |
| XMMPSF-MIXFACT-IFILE# | xmmpsf | Set filename to read mixing factors. |
| XMMPSF-MIXFACT-OFILE# | xmmpsf | Set filename to write mixing factors. |
| NSA_FILE | nsa | Change filename used for model data. |
| NSAGRAV_DIR | nsagrav | Change directory used for model data files. |
| NSMAX_DIR | nsmax | Change directory used for model data files. |
| ZXIPCF_DIR | zxipcf | Change directory used for model data files. |
Examples:
XSPEC12> xset neivers 2.0 // Set the NEIVERS variable to 2.0 XSPEC12> xset // List the current string variables XSPEC12> xset apecroot /foo/bar/apec_v1.01 // Set the APECROOT variable XSPEC12> xset seed 1515151 // Re-initialize the pseudo random-number generator // with the seed value 1515151