
					+-----------------------------------+
					| HT Format Description (tbl files) |
					+-----------------------------------+







1.- Station Information:
------------------------

	SCODE	char	Station Information

		st_code		char	Station code
		st_net		char	Network code
		st_lat		double	Latitude
		st_lon		double	Longitude
		st_elev		double	Elevation
		st_name		char	Station name


	STINST	char	Station Instrumentation
		
		st_nsen		int	Number of sensors
		st_npre		int	Number of preamplifiers
		st_ndig		int	Number of digitizers
		st_ndlg		int	Number of dataloggers
		st_sdat		char	Start date
		st_edat		char	End date


	SENSN	char	Sensor Information

		se_sn		char	Sensor serial number
		se_no		int	Sensor number
		se_lat		double	Sensor latitude		[Not mandatory]
		se_lon		double	Sensor longitude	[Not mandatory]
		se_elev		double	Sensor elevation	[Not mandatory]
		se_dep		double	Sensor depth
		se_nch		int	Sensor number of components


	SENCA	char	Sensor Orientation & Channel Assignments

		se_chn		int	Sensor component number
		se_pdn		int	Preamplifier/digitizer number
		se_dtyp		char	Digitizer type
		se_az		double	Sensor azimuth
		se_dip		double	Sensor dip
		se_pdch		int	Preamplifier/digitizer connector channel
		se_pdtyp	char	Specifies preamplifier/digitizer	[F/D - Not mandatory]


	PAMPSN	char	Preamplifier Information

		pa_sn		char	Preamplifier serial number
		pa_nch		int	Preamplifier number of channels


	PAMPCA	char	Preamplifier Channel Assignments

		pa_no		int	Preamplifier number
		pa_dno		int	Digitizer number
		pa_chn		int	Preamplifier connector channel
		pa_dch		int	Digitizer connector channel


	DIGISN	char	Digitizer Information

		di_sn		char	Digitizer serial number	
		di_ndc		int	Number of primary channels
		di_nac		int	Number of auxiliary channels


	DIGICA	char	Digitizer Channel Assignments

		di_din		int	Digitizer number	[Digitizer number at a site [1..N]]
		di_dln		int	Datalogger number	[Datalogger number at a site [1..N]]
		di_dtyp		char	Digitizer type 		[DSP | AUX]
		di_conn		int	Digitizer connector channel
		di_dlch		int	Datalogger channel	["fixed=" number 4120:[1..8], Q680[1..12]]
		di_pol		char	Digitizer polarity
		di_dich		int	Digitizer channel	[Channel on digitizer board 4120:[1..4], Q680[1..3]
								 - Not mandatory]]


	DLOGSN	char	Datalogger Information

		dl_sn		char	Datalogger serial number
		dl_nch		int	Datalogger number of channels


	DLOGCA	char	Datalogger Channel Assignments

		dl_no		int	Datalogger number	[Datalogger number at a site [1..N]]
		dl_ch		int	Datalogger channel	["fixed=" number 4120:[1..8], Q680[1..12]]
		dl_dtyp		char	Digitizer type		[DSP | AUX]
		dl_dnum		int	Digitizer number
		dl_dch		int	Digitizer connector channel
		dl_iac		char	SEED instrument and orientation code
		dl_nfc		int	Number of filter channels


	DLOGFC	char	Filter Information

		fi_dln		int	Datalogger number
		fi_schn		char	SEED convention channel name
		fi_sps		double	Sampling rate
		fi_mrgf		double	Master rgain frequency
		fi_ctol		double	Clock tolerance
		fi_dtyp		char	Data type		[TG | CG]
		fi_seq		char	Filter sequence name
		fi_dfmt		char	Data format		[SEED | ...]
		fi_ctyp		char	Compression type	[STEIM1 | ...]
		fi_blks		int	Block size		[512 | 4096 | ...]





	From:					To:
========================================================================
SENCN/SENCA
	(se_no,se_chn)				(se_pdn,se_pdch)
      = (sensor #, component)			(digitizer #, connector channel)

DIGICA:
	(di_din,di_conn)			(di_dln, di_dlch)
      =	(digitizer #, connector channel)	(datalogger #, datalogger channel (fixed))

DLOGCA & DLOGFC
	(dl_no, dl_ch)				(filter, seed channel)	
						(may be many of these w/diff filters)


2.- Sensor Information:
-----------------------

	SENSOR	char	Sensor Information

		set_sid		char	Sensor identification
		set_sn		char	Sensor serial number
		set_sdat	char	Sensor start date
		set_edat	char	Sensor end date
		set_ncmp	int	Sensor number of components


	SC	char	Sensor Component Information

		set_chan	char	Sensor channel
		set_styp	char	Sensor type
		set_units	char	Sensor units
		set_sens	double	Sensor sensitivity
		set_freq	double	Frequency
		set_nlin	int	Number of lines following of type HP, LP, CP, CZ, or PN which
					describe the instrument response



3.- Preamplifier Information:
-----------------------------

	PREAMP	char	Preamplifier Information

		pat_paid	char	Preamplifier identifications
		pat_sn		char	Preamplifier serial number
		pat_sdat	char	Preamplifier start date
		pat_edat	char	Preamplifier end date
		pat_nchn	int	Number of preamplifier channels


	PA	keyword	char	Preamplifier Information

		pat_chan	int	Preamplifier channel
		pat_gain	double	Preamplifier gain
		pat_freq	double	Preamlifierp calibration frequency
		pat_nlin	int	Number of lines following of type HP, LP, CP, CZ, or PN which
					describe the preamplifier response



4.- Datalogger Information:
---------------------------

	DATLOG	char	Datalogger Information

		dlt_type	char	Datalogger type
		dlt_sn		char	Datalogger serial number
		dlt_firm	char	Datalogger firmware number
		dlt_sdat	char	Datalogger start date
		dlt_edat	char	Datalogger end date
		dlt_ndm		int	Number of digitizing boards


	DM	char	Digitizer Board

		dlt_slot	int	Digitizer board number
		dlt_dmsn	char	Digitizer serial number
		dlt_nch		int	Number of digitizer channels (Lines of type DMCS)


	DMCS	char	Digitizer module 

		dlt_chan	int	Digitizer module number (channel)
		dlt_sens	double	Digitizer channel sensitivity



5.- Filter Information:
-----------------------

	FIRFS	char	Filter Sequence Information

		fit_seqn	char	Filter sequence name
		fit_nstg	int	Filter number of stages


	DFILTER	char	Filter Information

		fit_gain	double	Filter gain
		fit_freq	double	Frequency for filter gain (- => period in seconds)
		fit_rgai	double	Filter gain
		fit_rfrq	double	Frequency for filter gain (- => period in seconds)
		fit_nlin	int	Number of lines of type INPUT, DELAY, & FIR, HP, LP, CP, CZ & PN
					which follow


	INPUT	char	Input/Output Information

		fit_irat	double	Stage input sampling rate
		fit_orat	double	Stage output sampling rate
		fit_ssdd	int	Sample selected during decimation


	DELAY	char	Delay Information

		fit_dof		double	Filter delay in seconds
		fit_datt	double	Delay applied to time-tag in seconds


	FIR	char	FIR Filter Information

		fit_fnam	char	Filter name
		fit_sym		char	Filter symmetry		[EVEN | NONE]
		fit_gof		double	Filter gain 
		fit_for		double	Set to "0.0" to calculate filter gain at specified frequency


	GAIN	char	Gain Information

		fit_oagn	double	Overall gain of channel
		fit_oagf	double	Frequency at which overall gain is calculated
					If fit_oagn == 0, compute overall gain
		fit_rgn		double	Gain at the response frequency
					If fit_rgn == 0, compute it
		fit_rgf		double	Frequency at which fit_rgn is calculated



6.- Response Information:
-------------------------

	HP	char	High-Pass Filter Information

		set_ftyp	char	Filter type	[BW = Butterworth   |
							 DG = damping given |
							 ND = no damping]
		set_npol	int	Number of poles in filter
		set_corn	double	corner frequency of filter (- for period)
		set_damp	double	Fraction of critical damping (if applicable)


	LP	char		Low-Pass Filter Information

		set_ftyp	char	Filter type	[BW = Butterworth |
							 DG = damping given |
							 ND = no damping]
		set_npol	int	Number of poles in filter
		set_corn	double	Corner frequency of filter (- for period)
		set_damp	double	Fraction of critical damping (if applicable)


	CP	char	Complex Pole Information

		set_real	double	Real part of complex pole
		set_imag	double	Imaginary part of complex pole


	CZ	char	Complex Zero Information

		set_real	double	Real part of complex zero
		set_imag	double	Imaginary part of complex zero


	PN	char	Polynomial Information

		set_pnam	char	Polynomial name



7.- Polynomial Information:
---------------------------

	POLY	char	Polynomial Information

		set_pnam	char	Polynomial name
		set_pnat	char	Type of polynomial approximation	[C = Chebychev |
										 L = Legendre  |
										 M = MacLaurin]
		set_pnlb	double	Polynomial lower bound for which approximation is valid
		set_pnub	double	Polynomial upper bound for which approximation is valid
		set_pnme	double	Maximum error of polynomial approximation
		set_npnc	int	Number of polynomial coefficients which follow
		set_pncf	double	Polynomial coefficients (up to 14)


