C ELM2B               TYPE 2  CALCULATED QUANTITIES -- SEE PAGE 2-3 OF
C
C SB                     SEC (BETA)
C TB                     TAN (BETA).
C BEFORE       LOGICAL   TELLS IF POLE FACE ROTATION IS ENTRANCE OR EXIT
C
      LOGICAL         BEFORE
      COMMON /ELM2B/  SB, TB, BEFORE