The file ura_stis2012_datacube.fits contains the 2012 Uranus STIS hyperspectral data cube as described by Sromovsky et al. (2014, Icarus). This FITS file contains calibrated I/F values as a function of wavelength and location, with a navigation back plane that provides viewing geometry and latitude-longitude coordinates for each pixel. The following documents the FITS extension names, numbers, and dimension (produced with the IDL astronomy library fits_help routine). In the following table, bitpix of -32 signifies a 32-bit floating point value type (REAL*4). XTENSION EXTNAME EXTVER EXTLEVEL BITPIX GCOUNT PCOUNT NAXIS NAXIS* 0 16 0 0 0 1 IMAGE SCI 1 -32 1 0 3 75 x 150 x 1800 2 IMAGE WAVELENGTH -32 1 0 1 1800 3 IMAGE LAT_CENTRIC -32 1 0 2 75 x 150 4 IMAGE LAT_GRAPHIC -32 1 0 2 75 x 150 5 IMAGE REL_LON_EAST -32 1 0 2 75 x 150 6 IMAGE MU_OBS_COS -32 1 0 2 75 x 150 7 IMAGE MUZ_SUN_COS -32 1 0 2 75 x 150 8 IMAGE AZIMUTH -32 1 0 2 75 x 150 Note that the SCI extension is in units of I/F. There has been no correction for ring absorption or scattering. Wavelengths run from 300.4 nm to 1020.00 nm, in steps of 0.4 nm. Geometry planes have been added for pixels on the planet. The mu extension (MU_OBS_COS) indicates whether the center of a particular pixel is on the planet, going from 0 to 1 for navigated pixels, or set to -9.9999 for space pixels. The geometry refers to the center of the pixel. Columns are parallel to the spin axis of Uranus and column index (the first and most rapidly changing index) increases towards the center of the planet. Row index increases from south to north. The sub-observer point is at the 75th row and 75th column ((74,74) zero-based coordinates). The third dimension of the I/F data cube is wavelength. WAVELENGTH is in nm. LAT_CENTRIC and LAT_GRAPHIC are planetocentric and planetographic latitudes, respectively, in degrees. REL_LON_EAST is longitude relative to the central meridion in degrees, increasing eastward. MU_OBS_COS is the cosine of the observer zenith angle. MUZ_SUN_COS is the cosine of the solar zenith angle. AZIMUTH is the angle between projections of the vectors from the sun to Uranus and from Uranus to the observer onto the tangent plane at the observed location on the planet, measured in degrees. A sample IDL program that reads the cube file, plots a monochromatic image, extracts data from a particular location on the disc, and plots a spectrum, is provided in the file stis_cube_read_example.pro. The IDL astronomy library will be needed to read the data cube.