*REJ Section

RFM Driver Table Sections: Weak Line Rejection

17JAN24
Type
Secondary Section — activated by REJ Flag.

Description
Minimum line strengths (adjusted for path conditions) to be used for widemesh and finemesh calculations.

Format
Multiple records, fixed record structure
Record Structure
GAS STR
Fields
FieldTypeDescription
GAS C7 Line molecule to which rejection limit is applied, or '*' [2]
STR R Minimum Line strength for inclusion [3]
Type: I=Integer; R=Real; D=Double Precision; Cn=character string, length n.

Notes
  1. The main purpose of rejecting weak lines is to decrease the CPU time for calculations. However, if it is used, you are advised to perform tests to verify that significant lines are not excluded.

  2. GAS can be any line molecule used in the calculation, including isotopic variants (eg as 'H2O(4)' for HDO). Optionally, a wildcard '*' may be used to specify a minimum strength for all (other) line molecules which are not explicitly listed in this section (otherwise all lines for these molecules will be included)

  3. STR is in units of HITRAN line intensity (per molecule) multiplied by Avogadro's number (per kmole, so approx 6E26), which is how the RFM uses these numbers (the scaling is to allow strengths to be represented by single precision — see STR field in .hit file format).

Example
*REJ CO2 1.0E-8 ! Threshold for CO2 lines H2O(4) 1.0E-9 ! Threshold for HDO lines * 1.0E-10 ! Threshold for all other lines

Bugs
[none reported]