Keywords: class

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## Hyperfine structure profile fit results (for spectra)

Observation version 1 (dynamic size) since 22-feb-2021:
The section size is now dynamic and can offer space for less or more than 3 lines, always with `mhfslin` `nline`. `mhfslin`, and thus the array sizes (`mhfsfit`), is implicit and can be guessed from the section length (by reverting the `class_sec_hfs_len` formula below). Using `mhfslin` ensures backward compatibility with older CLASS versions. Other values are read incorrectly with such versions.

Observation version 1 (static size):

      ! HFS: "Hyperfine Structure" profile fit results (e.g. NH3, HCN, for spectra).
      integer(kind=4), parameter :: class_sec_hfs_id=-13
      integer(kind=4), parameter :: mhfslin=3
      integer(kind=4), parameter :: nhfspar=4  ! Number of parameters per line
      integer(kind=4), parameter :: mhfsfit=nhfspar*mhfslin
      integer(kind=4), parameter :: class_sec_hfs_len=3+2*mhfsfit
      type hfs
         sequence
         integer(kind=4) :: nline          ! Number of components
         real(kind=4)    :: sigba          ! Sigma on base
         real(kind=4)    :: sigra          ! Sigma on line
         real(kind=4)    :: nfit(mhfsfit)  ! Fit results
         real(kind=4)    :: nerr(mhfsfit)  ! Errors
      end type hfs