Use of Tolerances

The option to apply tolerances interactively is selected at the main menu. First of all the user is asked to confirm (and alter if required) the values of the tolerances to apply, and then the user can select which tolerances to use. It is possible merely to set the values, but not to apply them at the time, for example if you wanted to set them up for use in batch mode.

In the following example the maximum allowed height is set to $10^{7}$, and then tolerances are applied on height, centre and width.

Main menu [MANUAL] - TOLS
Tolerances on position are relative to the line's rest wavelength

=========< E d i t   T o l e r a n c e s >=========

V_Tol %F : Absolute error of line centre .... = 1.8994141E-02
V_MAx %F : Max allowed line centre .......... = 3
V_MIn %F : Min line centre .................. = -3
W_Tol %F : Absolute error of line width ..... = 1.8994141E-02
W_MAx %F : Max allowed line width ........... = 4
W_MIn %F : Min allowed line width ........... = 0.1899414
W_S_n %F : Width signal/noise ............... = 5
H_MAx %F : Max allowed line height .......... = 1000
H_MIn %F : Min allowed line height .......... = 20
H_S_n %F : Height signal/noise .............. = 5
C_tol %F : Absolute error of Cauchy parameter = 2.0000001E-03
S_tol %F : Absolute error of Skew parameter . = 2.0000001E-03
H_Tol %F : Absolute error of height ......... = 3
Apply    : Apply tolerances now
Exit     : Exit but don't apply tolerances now
Edit Tolerances - H_MAX 1E7

=========< E d i t   T o l e r a n c e s >=========

V_Tol %F : Absolute error of line centre .... = 1.8994141E-02
V_MAx %F : Max allowed line centre .......... = 3
V_MIn %F : Min line centre .................. = -3
W_Tol %F : Absolute error of line width ..... = 1.8994141E-02
W_MAx %F : Max allowed line width ........... = 4
W_MIn %F : Min allowed line width ........... = 0.1899414
W_S_n %F : Width signal/noise ............... = 5
H_MAx %F : Max allowed line height .......... = 1.E7
H_MIn %F : Min allowed line height .......... = 20
H_S_n %F : Height signal/noise .............. = 5
C_tol %F : Absolute error of Cauchy parameter = 2.0000001E-03
S_tol %F : Absolute error of Skew parameter . = 2.0000001E-03
H_Tol %F : Absolute error of height ......... = 3
Apply    : Apply tolerances now
Exit     : Exit but don't apply tolerances now
Edit Tolerances - APPLY

=========< S e t   R e j e c t i o n   C r i t e r i a >=========

Height      : Test on HEIGHT....... = F
Centre      : Test on CENTRE....... = F
Width       : Test on WIDTH........ = F
Errors      : Test on ERRORS....... = F
S/n         : Test on S/N.......... = F
SHape       : Test on SHAPE........ = F
SEparations : Test on SEPARATIONS.. = F
Log         : Log failures ........ = F
Apply       : Apply tolerances now
Set Rejection Criteria - CENTRE

=========< S e t   R e j e c t i o n   C r i t e r i a >=========

Height      : Test on HEIGHT....... = F
Centre      : Test on CENTRE....... = T
Width       : Test on WIDTH........ = F
Errors      : Test on ERRORS....... = F
S/n         : Test on S/N.......... = F
SHape       : Test on SHAPE........ = F
SEparations : Test on SEPARATIONS.. = F
Log         : Log failures ........ = F
Apply       : Apply tolerances now
Set Rejection Criteria - HEIGHT

=========< S e t   R e j e c t i o n   C r i t e r i a >=========

Height      : Test on HEIGHT....... = T
Centre      : Test on CENTRE....... = T
Width       : Test on WIDTH........ = F
Errors      : Test on ERRORS....... = F
S/n         : Test on S/N.......... = F
SHape       : Test on SHAPE........ = F
SEparations : Test on SEPARATIONS.. = F
Log         : Log failures ........ = F
Apply       : Apply tolerances now
Set Rejection Criteria - WIDTH

=========< S e t   R e j e c t i o n   C r i t e r i a >=========

Height      : Test on HEIGHT....... = T
Centre      : Test on CENTRE....... = T
Width       : Test on WIDTH........ = T
Errors      : Test on ERRORS....... = F
S/n         : Test on S/N.......... = F
SHape       : Test on SHAPE........ = F
SEparations : Test on SEPARATIONS.. = F
Log         : Log failures ........ = F
Apply       : Apply tolerances now
Set Rejection Criteria - APPLY
Testing on: HEIGHT CENTRE WIDTH
75 fits rejected

The option to log the failures lists, for each fit at each cross-section which fails the tolerances, the reason why it failed, and the value of the relevant parameter. For a large data set this can produce a large amount of output! Returned fits will also be listed (if you relaxed your rejection criteria). Otherwise the number of fits rejected is all that is listed. Note that the testing ignores blocking, so each cross-section for each line is counted as a separate fit.

The tolerances are as follows, and apply to each component of the fit unless otherwise stated (i.e. if one component fails, the fit is rejected):

HEIGHT

Fits are accepted only if their height is greater than H_MIN and and less than H_MAX.

CENTRE

Fits are accepted only if their centre is greater than V_MIN and and less than V_MAX.

WIDTH

Fits are accepted only if their width is greater than w_MIN and and less than W_MAX.

ERRORS

Fits are accepted only if the error on the height is less than H_TOL, that on width less than W_TOL and that on centre less than V_TOL.

S/N

Fits are accepted only if the ratio of Height to Error on height is greater than H_S_N and if the ratio of width to its error is greater than W_S_N.

SHAPE

The fit is rejected if the error on a Cauchy fit is greater than C_TOL.

SEPARATIONS

For the moment this is ignored!