Upper and middle panels: normalized contribution functions of Stokes I as well as the anisotropy at 3871.2 Å in the (1, 1) bandhead (thin solid lines), at 3869.1 Å in a CN blend (dotted lines) and at the local continuum (dashed lines). The contribution functions are given for five μ values: from 0.1 (rightmost) to 0.5 (leftmost). The FALC temperature as a function of height is given in the upper panel (thick solid line, right scale). Lower panel: branching coefficients for the source function of P₁(14) (3869.1 Å) line: thermal (solid line), Raman (dotted line) and Rayleigh (dashed line). Assumed  value is 0.3.