Fig. 13. a Calculated intensity ratio for the C II  -  (1036 Å) multiplet component ratio I(3/2-1/2)/I(1/2-1/2) based on the VAL model vs raster position in arc sec relative to the disc centre compared with the observed ratios. The solid curve uses and the dashed line, g. The shifted limb position at 956.20 arc sec is used. b Calculated intensity ratios for the C III  -  (1175 Å) multiplet component ratios I(2-2)/I(1-2) and I(0-1)/I(2-1) vs raster position in arc sec relative to the disc centre compared with the observed ratios.