added backbone script to produce markers. So far it starts from (R,z,E,pitch)...

added backbone script to produce markers. So far it starts from (R,z,E,pitch) and computes (x,y) assuming phi=0. Computes also vpara, vperp, vtot."
5 jobs for 54-build-distribution-markers-ids in 1 minute and 59 seconds (queued for 7 seconds)
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