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Example
Given the two temperature model AB*(RZ+RZ) constrain the metallicities
of the two additive components to be the same. First display the model
(bounds omitted):
> sshow \
Existing model is: AB*(RZ+RZ)
Component 1 - AB
1) hydrogen column density (1.0E21 /cm**2) EF 0.30000
Component 2 - RZ
2) em10 (1E60cm**-3/(10kpc)**2) E 1.91760E-05
3) temperature (keV) E 0.93121
4) metal abundance (solar) E 0.25343
Component 3 - RZ
5) em10 (1E60cm**-3/(10kpc)**2) E 2.82116E-05
6) temperature (keV) E 0.98383
7) metal abundance (solar) E 0.32822
Add a tie,
> tie add
TIE Version 1.8-0
NUM - Tie numbers /'1'/ >
PARS - Parameters to tie together > 4,7
Display the model again:
> sshow \ ;
Existing model is: AB*(RZ+RZ)
Component 1 - AB
1) hydrogen column density (1.0E21 /cm**2) EF 0.30000
Component 2 - RZ
2) em10 (1E60cm**-3/(10kpc)**2) E 1.91760E-05
3) temperature (keV) E 0.93121
4) metal abundance (solar) E 0.25343
Component 3 - RZ
5) em10 (1E60cm**-3/(10kpc)**2) E 2.82116E-05
6) temperature (keV) E 0.98383
7) metal abundance (solar) EC 0.32822
Note that parameter 7 is now constrained to be equal to parameter 4. The
constraints are not actually applied until the first invocation of SFIT
or SERROR. The ties can be displayed using,
> tie show \\
TIE Version 1.8-0
Tie Constraint
1 Equal(4,7)
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