;; GEM-T2 Model (Goddard Earth Model) from Wenzel's page (tide-free system)
;; $Id: gemt2.desc,v 1.1 2004/01/06 00:36:44 craigm Exp $
{ $
  name: 'GEM-T2', $             ;; Title of the model
  type: 'GRAVITY', $            ;; Type of model 'GRAVITY' or 'BFIELD'
  filename: 'GEMT2.MOD', $      ;; Model coefficient file name
  reference: 'Marsh, J.G. et al. 1989, "The GEM-T2 Gravitational Model," J. Geophysical Research, 95, 22043', $
  url: 'http://www.gik.uni-karlsruhe.de/~wenzel/geopmods/gemt2.zip', $
  normalized: 1, $              ;; Coefficients are normalized (1=yes, 0=no)
  mu: 398600.436d9, $           ;; GM for central body [m^3/s^2]
  a: 6378137d, $                ;; Mean equatorial radius [m]
  tide: 'FREE', $               ;; Tide system (ZERO, FREE, or MEAN)
  C21: -0.187d-9, $             ;; C21 coefficient (IERS Conventions 1996)
  S21:  1.195d-9, $             ;; S21 coefficient (IERS Conventions 1996)
  C20_dot: 0d, $                ;; C20 rate (unitless; yr^-1)
  C21_dot: 0d, $                ;; C21 rate (unitless; yr^-1)
  S21_dot: 0d, $                ;; S21 rate (unitless; yr^-1)
  nmax: 50L, $                  ;; Maximum order (inclusive)
  mmax: 50L, $                  ;; Maximum degree (inclusive)
  rowstart: 10L, $              ;; Coefficient starting row (first row = 0)
  nrows: 1018L, $               ;; Number of coefficient rows in file
  ncolrange: [0,4], $           ;; Column range for degree (first col = 0)
  mcolrange: [5,9], $           ;;    "     "    "  order 
  Ccolrange: [10,29], $         ;;    "     "    "  C coefficients
  Scolrange: [30,49], $         ;;    "     "    "  S coefficients
  dCcolrange: [50,64], $        ;;    "     "    "  C std deviation
  dScolrange: [65,79] $         ;;    "     "    "  S std deviation
}