function lin_interpol_Y1_60_90 input Real alpha_deg "Branching angle"; input Real w_rel_bc "Velocity ratio branch/common"; input Real Q_rel_bc "Volume flow rate ratio branch/common"; input Real F_rel_cb "Area ratio common/branch"; input Real A "Correction factor at alpha = 90°"; output Real zeta_cb; output Real zeta_cs; end lin_interpol_Y1_60_90;