*fold* - Make a folded light curve

Run fold on the timesorted output. This task computes the average or folded light curve for a single cycle of known period.

input file: rp90_sect2_sti.qp

output file: rp90_sect2_fld.tab

  xt> fold
  input source timing file:  rp90_sect2
  input background timing file (none): <cr>
  root name for outfile [root_fld.tab]: rp90_part2   # chosen so name of output
                                     # file different from that of Section 8.9.
  fold period in seconds: 100.14                   # this value chosen by user.
  number of bins:  10

The folded light curve may be displayed with the task fldplot.

  xt> fldplot rp90_part2_fld

Note: For error bars on plot set the parameter ecolumn=``err''.