Table 9: WCS keywords in the STIS table for two of the spectral columns.
1CTYP4 = `WAVE-TAB' / Coordinate type
1CUNI4 = `Angstrom' / Coordinate units
1S4_1 = `WAVELENGTH' / Coords for gross spectrum
1CTYP5 = `WAVE-TAB' / Coordinate type
1CUNI5 = `Angstrom' / Coordinate units
1S5_1 = `WAVELENGTH' / Coords background spectrum

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