This directory contains the spectra (and response matrices)
 of the X-ray background obtained with the HEAO1 A2 experiment
 (Marshall, et al., 1980 ApJ, 235, 4).
 The spectra and responses are in FITS format.

 hed11c.pha     h111095c.rsp   HED1 M1
 hed12c.pha     h121095c.rsp   HED1 M2
 hed31c.pha     h31257c.rsp    HED3 M1 
 hed32c.pha     h321095c.rsp   HED3 M2
 med1c.pha      m11n.rsp       MED  M1
 med2c.pha      m12n.rsp       MED  M2

 The led sub-directory contains the A2 LED C-band (0.25 keV) All-Sky 
 map of the soft X-ray diffuse background (Garmire et al. 1992, ApJ,
 399, 694) in FITS format.