Filters dedispersed time series data to remove low and/or high frequency variations. The data file should be in the SIGPROC .tim format.

While using this program, one should be careful not to over-filter the data as this may lead to fast/slow pulsars being filtered out.

This program requires a filter mask file. Filter mask files can be created using the yapp_genfiltermask.py Python script.

Usage:

• -h or --help: Display this usage information.
• -s or --skip time: Length of data to be skipped, in seconds (default is 0 s).
• -p or --proc time: Length of data to be processed, in seconds (default is all data).
• -f or --filter file: Filter mask filename.
• -g or --graphics: Turn on plotting.
• -i or --invert: Invert background and foreground colours in plots (default is white on black).
• -e or --non-interactive: Run in non-interactive mode.
• -v or --version: Display the version.

Example:

Filters the data in data.tim with a filter mask specified in the file yapp_mask_16384_0.0001_1.0_100.0.dat, with graphics turned on, and in interactive mode. The output is written to data_filtered.tim.