c c Routine directly callable from C/C++ (it could be necessary to c append an underscore, "_", to its name depending on the C/C++ c compiler used). c c subroutine olcrossed(olkey, updown, firstol, lastol) c c Given the crossed observing levels key (saved at each particle c record in the longitudinal tracking file), the first and last c observing levels and the direction of motion are reconstructed. c The encoding formula is the following: c c olkey = firstol + 512 * lastol + 512^2 * updown01 c c where updown01 is one if the particle goes upwards, zero c otherwise. The corresponding variable updown is decoded in a c slightly different way: It will be set to 1 if the particle c goes upwards, -1 otherwise. c c Written by: S. J. Sciutto, La Plata 1997. c c c Arguments: c ========= c c olkey........... (input, integer) Key with information about the c crossed observing levels. c updown.......... (output, integer) Up-down indicator: 1 if the c particle was going upwards, -1 otherwise. c firstol......... (output, integer) First observing level crossed c (0 LE firstol LE 511). c lastol.......... (output, integer) Last observing level crossed c (0 LE lastol LE 511). c c c<--->
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