Default Fit Values File fit.default

The format of this file is rigid with regard to the order and content of the lines. On any given line, comments can come before or after the numbers that the program wants, but not between them. Here is the skeleton:

Comment
Number of compactions n_c
First and last bins to combine (1)
... ...
First and last bins to combine (n_c)
Comment
Model form (true=broken)
Power law slope
If (model is broken) Break energy (else omit line)
If (model is broken) Second slope (else omit line)
Number of lines n_l
Line energy (1)
... ...
Line energy (n_l)
First and last bins to be used in analysis
Extra iterations
Normalization (true=automatic)
If (NOT(automatic)) Normalization Energy (else omit line)
Comment

This is an example.

BINNING
2 subsequent compactions
Combine 22 23
Combine 23 24 done
FIT PARAMETERS
1 Model form: (broken power law)
Power law slope: 2.1     
Break energy: 400.0 MeV  / If the model were 0 for straight,
Second slope: 2.3        \ these two lines would be missing.
1 line
Line energy: 1000. MeV   <- One text line for each energy.
Bins used in analysis: 1 23 of 23 
2 extra iterations 
1 on Auto normalization (yes)

... ...
The program starts with 25 bins plus an extra one for class C. Bins 22 and 23 are fused then into one, which moves down bins 24 and 25 to 23 and 24; then bins 23 and 24 are combined. By this point bin 23 has all the counts that belonged to the original bins 23-25.

The continuum model is chosen by saying either 0 for a straight power law or 1 for a power law that is broken in one place. (No, 2 won't get you two breaks.) The break energy and guesses for the power law slopes follow. A spectral line is placed at 1000 MeV. The analysis will use bins 1-23, omitting the Class C (zeroth) bin. The least-squares fit will iterate twice past the initial run. Normalization relates to the way the power-law intensity is specified; here it means that the intensity is specified at the break energy.