Parameters RSTART, RENDLD, RENDAI
RSTART is the starting point of the integration. If the flag LOGDFL = .FALSE., then the entire integration, from RSTART to RENDAI, is done using
the Airy propagator. Normally, LOGDFL = .TRUE., and the log-derivative
propagator is used from RSTART to RENDLD, and then the Airy propagator
from RENDLD to RENDAI
RENDLD is the step size (sector width) in the log-derivative integration. If
LOGDFL = .false., then RENDLD is set equal to RSTART.
RENDAI is the end point for the integration, the point at which the S matrix
is determined. If the flag AIRYFL = .FALSE., then
RENDAI is set equal to RENDLD.
The parameter FSTFAC controls the ratio between the step size
in the log-derivative integration (given by the parameter SPAC)
and the step size in the Airy integration.
In bound-state calculations (flag BOUNDC = .TRUE.), then
RSTART and RENDAI define the range of the R-dependent wavefunction.
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