plt_rrs :
plt_rrs [options] -R rrfile | record annotator [start [end]]
	Plot RR intervals or RR interval heart rates
	options :
	  [-P 2|4|8|16|24|32] : plot 2, 4, 8, 16, 24 or 32 hours per page
                               (default: scale page length to data length)
	  [-R rrfile] : RR interval file : time (sec), interval
	  [-N] : plot NN intervals instead of RR intervals
	  [-H] : plot RR/NN interval heart rate
	  [-F "filt hwin"] : filter intervals, plot filtered data
	  [-f "filt hwin"] : filter intervals
	  [-p] : plot points
	  [-I c|h|m] : input time format: hh::mm:ss, hours, minutes (default: seconds)
          [-m] : RR intervals in msec
	  [-y "ymin ymax"] : y axis limits
	  [-o] : output postscript


get_hrv :
get_hrv [options] -R rrfile | record annotator [start [end]]
	Get HRV statistics :
	REC : NN/RR AVNN SDNN SDANN SDNNINDX RMSSD PNN : TOTPWR ULF VLF LF HF LF/HF
	options :
	  [-R rrfile] : RR interval file : time (sec), interval
	  [-f "filt hwin"] : filter outliers
	  [-p "nndiff ..."] : nn difference for pnn (default: 50 msec)
	  [-P "lo1 hi1 lo2 hi2 lo3 hi3 lo4 hi4"] : power bands
		(default : 0 0.0033 0.0033 0.04 0.04 0.15 0.15 0.4)
          [-s] : short term stats of
	         REC : NN/RR AVNN SDNN RMSSD PNN : TOTPWR VLF LF HF LF/HF
	  [-I c|h|m] : input time format: hh::mm:ss, hours, minutes (default: seconds)
          [-m] : RR intervals in msec
	  [-M] : output statistics in msec rather than sec
          [-L] : output statistics on one line 


statnn :
Usage: statnn [options]
Reads stdin: time(sec), interval(sec), annotation
and calculates nn interval stats
Outputs nn/rr, avnn, sdnn, sdann,
sdnnindx, rmssd and pnn on stderr
  options :
  [-l len] : window length (default 5:00)
  [-m] : RR intervals in msec
  [-p nndif ...] : nn diffenence for pnn
  [-s] : short term stats
         nn/rr, avnn, sdnn, rmssd and pnn on stderr
  [-L] : print ratio avnn sdnn sdann sdnnindx rmssd pnns on one line


rrlist :
Usage: rrlist annotator tape [options]
options are :
  [-f start] : begin at time 'start'
  [-t end] : end at time 'end'
  [-l length] : output for duration 'length'
  [-n count] : output 'count' intervals
  [-c] : output time in hh:mm:ss in first column
  [-h] : output time in hours in first column
  [-m] : output time in minutes in first column
  [-s] : output time in seconds in first column
  [-e] : output elapsed time from start
  [-a annotation] :   list only intervals between consecutive annotations
  [-r] : output ratio of specified annotation intervals to RR intervals
  [-H] : high precision intervals (8 significant digits vs 3)
  [-M] : output intervals in msec


filt :
Usage: filt filt hwin [options]
  Reads 1 (y) or 2 (x,y) columns from stdin and
  filters outliers by deleting those intervals outside
  of `filt' range of the average within a window
  `hwin' distance on either side of the
  current interval.
  options are :
  [-x min max] : exclude date outside min - max
  [-n] : print ratio of nout to nin
  [-p file] : print excluded points to file
              not including start/end hwin buffer
  excluded points may not be printed in time
  sequential order if -x opption is used


filtnn :
Usage: filtnn [options] filt hwin
  Reads 2 (y,ann) or 3 (x,y,ann) columns from stdin and
  filters NN intervals by marking intervals not within `filt'
  range from the average of intervals
  within a window `hwin' distance on either side of
  current interval.
  NEED TO DO A `sort -n' ON FILTERED SERIES TO RESTORE TIME ORDER
  options are :
  [-n] : print ratio of nnout to nnin to rrin
  [-x min max] : exclude date outside min - max
  [-p] : print excluded data at start/end of hwin buffer
  [-C ann] : change annotation of excluded points to ann (default: X)


pwr :
Usage: pwr [-r] [-L] lo1 hi1 ... [lo10 hi10]
  Calculate total (and relative) power in fft between lo and hi.
  options :
  [-r] : print ratio of powers to total
  [-L] : print powers on one line


seconds :
Usage: seconds [[hh]:mm]:ss | -
  Convert string in [[hh:]mm:]ss to seconds
  `-' to read stdin


hours :
Usage: hours seconds | -
  Convert seconds to hh:mm:ss.
  `-' to read stdin