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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)

Web Master
Tue Oct 7 10:18:50 BST 1997