 generate type 1 tables
generate type 2 tables

# GENERATE NEW OPAL OPACITY TABLES

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The element abundances are defined by X (hydrogen mass fraction, Y (helium mass fraction), and Z (metal mass fraction) where X+Y+Z=1. There are 19 metals included in the calculations and their relative abundance also have to be specified. There are currently two types of OPAL Rosseland mean opacity tables available and supported by interpolation codes. The latter allow interpolation for Rosseland mean opacities as well as first derivatives.

## Type 1 Tables

A set of tables with a fixed relative metal distribution (e.g., fixed [Fe]/[O]). A set consists of 126 tables with different X and Z values.

The supporting code for type 1 tables is XZTRIN21.f interpolating in R, T, X, and Z. Details of how to use the interpolation code are given as comments in the source file.

If this is the desired type of table, click here to generate type 1 tables.

## Type 2 Tables

A set of tables with a fixed relative metal distribution but where the mass fractions of two metals, say i and j (with 6 < atomic number < 14), are allowed to increase by dX(i) and dX(j), independent of the initial metal distribution. A subset consists of tables (exact number depends on composition) at fixed values of X and Z with 0 < dX(i), dX(j) < 1-X-Z allowing interpolation in dX(i), dX(j). A set permits interpolation in X by having 5 of these subsets at the same Z but each with X = 0, 0.03, 0.1, 0.35, and 0.7, respectively.

The supporting interpolation code for the Type 2 tables is XCOTRIN21.f interpolating in R, T, X, dX(i), and dX(j) at a given Z value. Details of how to use the code are given as comments in the source file.

A set of Fortran subroutines designed to interpolate Type 2 tables in metallicity Z have been developed by Arnold Boothroyd.

If this is the desired type of table, click here to generate type 2 tables.