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CONTZE

       REAL FUNCTION  CONTZE (TA, TB, F1, F2, ER)
 C$    (ALG626 - Internal Zero)
 C$    Compute zero between TA and TB.
 C$
 C$    F1..............Function value at TA.
 C$    F2..............Function value at TB.  F1 and F2  must have
 C$                    opposite sign.  This must be checked before
 C$                    entry.
 C$    ER..............permitted error for solution.
 C$
 C$    The method is a combination of the Regula Falsi and the
 C$    midpoint method.
 C$    (20-AUG-85)