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LINES
FIT\LINES [N] [/NOCURSOR] [/INPUT File_Name]
Enter the initial values for the profile fit. If argument "AUTO" is
given instead of a number, then the number of lines found in the last
read spectrum will be used for ITERATE command.
If N is not specified, then the last value for N is used. If N is 0,
MINIMIZE will attempt to guess initial values for a single line by com-
puting the moments of the spectrum. If N is not 0, LINES prompts for
the initial values for line parameters. N is limited to 5. These values
should be separated by spaces and can be entered as SIC expressions as
follows:
Method Code,Value Code,Value Code,Value Code,Value
GAUSS Temperature Position Width
SHELL Area (K.MHz) Offset (MHz) Width (MHz) Horn/Center
NH3 Temperature Position Width (MHz) Opacity
HFS Temperature Position Width (MHz) Opacity
The code is an integer interpreted as follows :
0 adjustable parameter
1 fixed parameter
2 adjustable parameter (head of group)
3 parameter fixed with respect to parameter coded 2 or 4
4 fixed parameter (head of group)
Codes 2 3 and 4 are used to fit dependent lines (e.g. HCN, for which the
displacements are 4.842 and -7.064 km/s, or -1.431 and 2.088 MHz, and
line ratios 1:0.6:0.2). Codes 0 and 1 only are allowed for NH3 method.
The value for a parameter with code 3 should be either the ratio to the
head of group value (for both intensity and width), or the offset from
head of group (for the position).
If the cursor is available, you will have to define the boundaries of
the N lines. The program then computes the moments of the spectra be-
tween these boundaries as input values. You cannot change the codes in
this way which is meaningfull ONLY FOR FREE and INDEPENDENT lines. This
cursor selection is not used if you specify the /NOCURSOR option.
Guesses can be read from an input file using the /INPUT File_Name op-
tion. "Free" format is used to read in this input file. The first line
must contain the number of lines, others are as the input at the key-
board.
Command LINES is not supported for method CONTINUUM.
Gildas manager
2011-09-07