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*DECK SYB43C
SUBROUTINE SYB43C(PP,TAUI)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Evaluation of the $D_i$ function in 1D spherical geometry.
*
*Copyright:
* Copyright (C) 2005 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* TAUI optical path in volume i.
*
*Parameters: output
* PP value of the expression.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
REAL PP,TAUI
*
IF(TAUI.GT.0.004) THEN
PP=TAUI-1.0+EXP(-TAUI)
ELSE IF(TAUI.GT.0.002) THEN
PP=TAUI-1.0+EXP(-TAUI)
PQ=0.5*(TAUI**2)
FACT=500.0*(TAUI-0.002)
PP=PP*FACT+PQ*(1.0-FACT)
ELSE
PP=0.5*(TAUI**2)
ENDIF
RETURN
END
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