ISIS - "invalid polynom number in the file" error

[Robin Leadbeater]

I am trying to wavelength calibrate a spectrum using "file mode" The xxx.lst file was generated from another spectrum using the "dispersion" tool and contains the polynomial constants

6294.203
0.0889662
-1.630411E-006
0.000000E+000
0.000000E+000

When I try to use this file to calibrate another spectrum, ISIS fails with the error "invalid polynom number in the file xxx.lst (valid values between 1 and 4) " but the polynomial order is not even included in the xxx.lst file.

Does anyone know what am I doing wrong?

Thanks!
Robin

[Martin Dubs]

Hi Robin,

in the Profile - Dispersion page there are 2 modes for storing dispersion.
- Save current line list
- Save polynom
Apparently you have chosen the second method
To use the calculated polynom you have to load the polynom on this page with "load a polynom". Then on the General tab you have to select "predefined dispersion equation".
The spectral file mode you tried to apply expects the order, dispersion and a line list, see here:
http://www.astrosurf.com/buil/isis/tuto ... ion_us.htm
In order not to mix up the two modes I name the polynom list xxx_pol.lst, the line list xxx_line.lst.

Hope this clarifies your problem.

Martin

[Robin Leadbeater]

Thanks Martin,

All is now clear

Cheers
Robin

[Robin Leadbeater]

Another quick related question Martin,

Saving the line list from the dispersion tab just saves the line wavelengths. Do you know if there is there a way of automatically generating the complete file used in "file mode" including the linear dispersion and order or do these have to be added to the file manually ?

Thanks
Robin