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SUBROUTINE SOLVE1(A1,R1,RP,XI,LAM2,LAM3,LAM4,CONT)
C
C ROUTINE TO SOLVE FOR LAMBDAS AS FNCTS. OF XI
C
C
REAL LAM2,LAM3,LAM4
C
IF (RP.EQ.0.0) GO TO 20
C
SUM = A1 + XI / RP
SINSUM = SIN(SUM)
BB = R1 - RP * (SIN(A1) - SINSUM)
RT = 0.0E0
IF( SINSUM .NE. 0.0E0 ) RT = BB / SINSUM
PSI1 = COS(SUM)
PSI2 = -SINSUM / RP
C
C CHECK FOR SHELL CAP CASE
IF ( A1 .NE. 0.0 ) GO TO 40
LAM2 = 0.0E0
IF( BB .NE. 0.0E0 ) LAM2 = PSI1 / BB
LAM3 = 1.0 / RP
LAM4 = -1.0 / RP**2
GO TO 50
C
C ALF1 = ALF2
C
20 SINA = SIN(A1)
COSA = COS(A1)
BB = R1 + XI * COSA
RT = 0.0E0
IF( SINA .NE. 0.0E0 ) RT = BB / SINA
PSI1 = COSA
PSI2 = 0.0
C
40 LAM2 = 0.0E0
IF( BB .NE. 0.0E0 ) LAM2 = PSI1 / BB
LAM3 = 0.0E0
IF( RT .NE. 0.0E0 ) LAM3 = 1.0E0 / RT
LAM4 = 0.0E0
IF( BB .NE. 0.0E0 ) LAM4 = PSI2 / BB
C
50 CONTINUE
RETURN
END
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