Adding lightcurves

If you want to sum the lightcurves from different channels, use ttag_lightcurve_channel_sum

Usage:
  ttag_lightcurve_channel_sum [-h] [-v level] output_file
                  input_file1 input_file2

Arguments:
  input_files    : ASCII files with 2 columns :
                     - time
                     - signal

  output_file    : ASCII file with 2 columns : 
                     - time 
                     - signal

Options:
  -h:  this help message                 
  -v:  verbosity level (=1; 0 is silent)

You can only sum 2 files at a time.

Note that the difference dt between the two first times appearing in the first input file is critical as explained below.

For each time t appearing in the first input file, the program looks for a time t2 appearing in the second input file that has value between t-dt/2 and t+dt/2. If t2 exists then t will appear in the output file.

Only the times that are common (in the way described above) to both inputs will appear in the output file.