Prime Keys are:
	CAMERA
	T_START
	HMI_SEQ_ID_FOCUS
DB Index Keys are:
	CAMERA
	T_START
	HMI_SEQ_ID_FOCUS
	T_STOP
All Keywords for series hmi.flatfield:
	TELESCOPE 	(string)	[TELESCOP]SDO/HMI
	INSTRUME  	(string)	[INSTRUME]HMI_SIDE1 or HMI_FRONT2
	CAMERA    	(int)	[CAMERAID]Camera ID
	T_START   	(time)	[T_START]Flatfield is valid from T_START ...
	HMI_SEQ_ID_FOCUS	(int)	[FOCUS_ID]Focus ID
	T_STOP    	(time)	[T_STOP]... to T_STOP
	FLATFIELD_VERSION	(int)	[FLAT_VER]Flatfield version number: >0: Flatfield final version, 0:Flatfield preliminay
	ROTF_FLATFIELD	(int)	[ROTF_BAD]Number of pixels corrected in the rotational flatfield
	ROTF_N_PAIRS	(int)	[ROTF_PAR]Number of image pairs used for the rotational flatfield
	ROTF_CADENCE	(float)	[ROTF_CAD]Cadence used for rotational flatfield
	T_OBS_OFFPOINT	link through OFFPOINT_FLAT	[T_OBS_OF]T_OBS of corresponding offpoint flatfield
	T_OBS_DARK	link through DARK	[T_OBS_DK]T_OBS of dark / bias
	T_OBS_BADPIX	link through BAD_PIXEL	[T_OBS_BD]T_OBS of bad pixel list
	DATE      	(time)	[DATE]Date_time of processing; ISO 8601
Segments for series hmi.flatfield:
	link through OFFPOINT_FLAT	offpoint flatfield
	link through DARK	bias /dark
	link through BAD_PIXEL	bad pixel array
	flatfield 	   none	   fits	4096x4096	0.000000
Links for series hmi.flatfield:
	BAD_PIXEL 	STATIC	hmi.bad_pixel_list	Link to the most current bad pixel array
	DARK      	STATIC	hmi.dark	Link to the most current dark
	OFFPOINT_FLAT	STATIC	hmi.offpoint_flatfield	Link to the offpoint flatfield