Column Name	Description	Example	Units	Data Type	VO UCD
ARCH_FILE	Archive File Name	VLA/XH00149/file_7	none	varchar	meta.file
ARCH_FILE_DATE	File Creation Date (MJD)	none	d	float	time.creation
ARCH_FILE_ID	Unique key for this obs. program in this file	181751519	none	int	none
ARCH_FORMAT	Data format : FITS-IDI, FITS-AIPS, VLA Exp	VLA Exp	none	varchar	none
BDF_FILE	EVLA/ALMA BDF file name	uid___evla_bdf_X1227136037120.bdf	none	varchar	meta.file
CATALOG_DATE	Date of DB entry (MJD)	53647.89721065	d	float	none
COMMON_FILE_ID	Used to connect images with uv data files	none	none	varchar	none
DATA_TYPE	raw or calibrated data	raw	none	varchar	none
ENTITY_ID	ASDM UID	uid://evla/bdf/X1227136037120	none	varchar	none
ENTITY_TYPE_NAME	File Type Description	bdf	none	varchar	none
FILE_ID	SDM/BDF File Name in NGAS Archive	uid___evla_bdf_X1227136037120.bdf	none	varchar	none
FILE_SET_ID	EVLA/ALMA SDM file set identifier	Xtestobs_091.54782.123456	none	varchar	none
FILE_SIZE	File size (kBytes)	144589	kByte	float	none
FILE_VERSION	NGAS archived file version number	1	none	float	none
IMAGEFILE	none	C0552M08.fits	none	float	meta.file
IMAGEFORAMT	none	image/fits	none	float	none
MIMETYPE	Data model for EVLA, VLA, VLBA, FITS	application/x-vla;datamodel=vla-exp	none	varchar	none
NGAS_HOST	NGAS node hosting this file	none	none	varchar	none
OBSSUMMARY_UID	EVLA/ALMA SDM format uid, uid://vla/1/123456789	uid://vla/1/123456789	none	varchar	meta.ref.uri
ROOTDIRECTORY	Directory path to image file location	/home/archive/surveys/NVSS	none	varchar	none
ROOT_DIRECTORY	Path to file in archive disk array	/home/archive_VLBA21/tapes	none	varchar	none
SITE_CODE	File Location Key : AOC, EVLA, CV, etc	AOC	none	varchar	none
STARTTIME	First data time in this observation (MJD)	51862.0065494	d	double	time.start
STOPTIME	Last data time in this observation (MJD)	51862.8362947	d	double	time.end