Produce a light curve for the source at 6940 9390, using timesorted QPOE file.
input file: rp90_sti.qp
output file: rp90_ltc.tab
xt> ltcurv # In the timing package
Input Source Timing File: rp90 # Only the root name is needed,
# the default extension is known
Input Background Timing File (NONE): <cr> # No bkg data
rootname for output file: rp90 or . # ``.'' will assign same root name
Number of Bins: 500 # 500 data bins
xt>