Target z offsets for PIONCT 04/12/06

Dave worked out that the cryotargets from the September survey are at:

Z (loop 1) = Z(carbon) - 0.93 mm
Z (loop 2) = Z(carbon) - 0.60 mm
Z (loop 3) = Z(carbon) - 0.70 mm

Using Z(carbon) = 2.5 mm in the lab frame

Z (loop 1) = 1.6 mm
Z (loop 2) = 1.9 mm
Z (loop 3) = 1.8 mm