README.timer - This ftp directory contains clock data from
	NRAO - Green Bank, West Virginia.

File Name   Description
---------   -----------------------------------------
MMMYY.GP    (example: APR93.GP) GPS log data from the DATUM GPS receiver
		at the Interferometer control building, collected by
		old HP9915 system.  One file per month.
		This is no longer being updated.

MMMYY.TP    (example: APR93.TP) clock offset data from the old HP9915
		system.  See timer.log for a description of formats.
		One file per month.
		This is no longer being updated.

YYYY_MM.tdat  (example: 1995_06.tdat)  Clock offset data from the new GBT
		MON/CTRL system.  One file per month.  See Gtimer.doc for
		description of format.

YYYY_MM.t0    (example: 1995_06.t0)    Clock offset data from the new GBT
		MON/CTRL system.  One file per month.  See Gtimer.doc.
YYYY_MM.t1    (example: 1995_06.t1)    Clock offset data from the new GBT
		MON/CTRL system.  One file per month.  See Gtimer.doc.

YYYY_MM_DD.gps (example: 1995_05_02.gps) GPS log data from the DATUM GPS
		receiver at the Interferometer control building, collected
		by the new GBT MON/CTRL system.  A file may include data
		from more than one month.  The file name is the starting
		date. 

SAOmaser.log - log of adjustments and repairs made to the SAO maser time
		standard at the 140-ft building.

STmaser.log  - log of adjustments and repairs made to the Sigma Tau maser
		at the Interferometer control building.

timer.log    - log of problems and changes with the old HP9915 clock offset
		recording system.

Gtimer.log   - log of problems and changes with the new GBT MON/CTRL clock
		offset recording system.

Gtimer.doc   - description of formats of *.tdat, *.t0, and *.t1 files.