eos06misc_mod.f

EOS06MISC_MOD holds the results and workspace of the OPAL 2006 equation-of-state interpolation: the interpolated quantities, the grid indices of the current point, the composition of the tables, the order of the quantities and the extent of each table row, shared by 9 routines. It replaces four COMMON blocks of rp_1, /EEOS06/ (ESACT, EOS), /AAEOS06/ (Q, H, XXH), /BBEOS06/ (L1–L4, K1–K4, IP, IQ) and /BEOS06/ (ZZ, IRI, INDEX, NTA, NRA), first merged into COMMON/EOS06MISC/ and then made a module (MHP via Claude, 10/20/26). The table dimensions MX = 5, MV = 10, NR = 169, NT = 197 are PRIVATE.

What its variables hold, who sets them, who reads them.

• EOS(MV): the interpolated quantities (in the order of ESAC06's notes: $P$, $E$, $S$, … , $\Gamma_2/(\Gamma_2-1)$; the tenth place, $\Gamma_3 - 1$, is never computed, ESAC06), set by ESAC06 (from ESACT, then scaled by $P_0$, $T_6$ and the mean molecular weight) and corrected for radiation by RADSUB06; read by the callers, OEQOS06, RHOOFP06 and CALCAD.
• ESACT: one quantity interpolated in $T_6$ and $\rho$ by T6RINTEOS06, from the quadratics H(4) (in $\rho$ at fixed $T$) and Q(4) (in $T$), its workspace.
• L1–L4, K1–K4, IP, IQ (INTEGER*4): the four density and four temperature indices around the point and the number of points used in each direction, set by ESAC06; read by T6RINTEOS06 and EQBOUND06.
• ZZ(MX): the $Z$ of each table, read from the table headers by READCOEOS06; read by ESAC06.
• INDEX(10): the order in which the quantities are stored (1 to 10, initialized); IRI(10): its inverse, set by SETEOS06; read by ESAC06 and RADSUB06.
• NTA(NR), NRA(NT): for each density the number of temperatures in the tables, and for each temperature the number of densities (the tables are not rectangular); initialized, read by READCOEOS06, EQBOUND06 and RHOOFP06.
• XXH (line 43↗): set and read nowhere (unused?).

A blanket USE EOS06MISC_MOD. L1–L4 are INTEGER*4 despite their initial letter, as CALCAD typed them. The initial values of INDEX, NTA, NRA moved from ESAC06's DATA statements (whole-array DATA in the module, the same values).