pix-CAMERA-EXPID.fits

Summary:: Pre-processed CCD pixel data.
Naming Convention:: pix-{CAMERA}-{EXPID}.fits, where {CAMERA} is the camera name (e.g. b0, r1, or z9), and {EXPID} is the 8-digit exposure ID.
Regex:: pix-[brz]{1}[0-9]{1}-[0-9]{8}\.fits
File Type:: FITS, 320 MB

Contents

Number	EXTNAME	Type	Contents
HDU0	ELECTRONS	IMAGE	Pre-processed electrons
HDU1	IVAR	IMAGE	Inverse variance [1/electrons^2]
HDU2	MASK	IMAGE	Mask 0=good, non-0 is bad

EXTNAME = ELECTRONS

Bias subtracted, pixel flat fielded, gain corrected CCD image in electrons.

Required Header Keywords Table

KEY	Example Value	Type	Comment
CAMERA	b0	str	Spectograph Camera
VSPECTER	0.0.0	str	TODO: Specter version
EXPTIME	1000.0	float	Exposure time [sec]
RDNOISE	3.0	float	Read noise [electrons]
FLAVOR	arc	str	Exposure type (arc, flat, science)

Data: FITS image

EXTNAME = IVAR

Inverse variance image of the electron image in HDU 0

Required Header Keywords Table

KEY	Value	Type	Comment
EXTNAME	IVAR	str	extension name
RDNOISE	3.0	float	Read noise [electrons]

Data: FITS image

EXTNAME = MASK

Mask image, where 0=good, non-0=bad.

Required Header Keywords Table

KEY	Value	Type	Comment
EXTNAME	MASK	str	extension name

Data: FITS image