> gtpspec evfile=my_pulsar_events_v3.fits \
            scfile=my_pulsar_spacecraft_data_v3r1.fits \
            psrdbfile=master_pulsardb_v3.fits psrname="PSR B0540-69" \
            outfile=gtpspec-example-1.fits binwidth=0.01 numbins=1000000 \
            timeorigin=MIDDLE ra=85.0482 dec=-69.3319 ephstyle=FREQ \
            f1f0ratio=0.0 f2f0ratio=0.0

    This command produces an output message that describes the search
    criteria and explains the search result.  A plot will also be
    produced.