The Einstein IPC has allowed to systematically survey the diffuse soft X-ray background in the (0.16-3.5 Kev) with angular resolution of 1 square degree in about 5% of the entire sky.

The moderate energy resolution of the IPC enable also to characterize and produce maps of the background density in the (0.16-0.8 keV) band and in the (0.8-3.5 keV) band , as well as of the X-ray background Hardness ratio [(0.8-3.5 keV)/(0.16-0.8 keV)].

These data allow to confirm that the Galactic ridge is not present at energy below 0.33 keV and demonstrate that the appearance of the ridge above
this energy is not due to hard Galactic sources with a flux above 10**-13 erg/cm**2/sec. There is a southern Galactic region, with l between 80 and
180 degrees and b less than 5 degrees, where the mean background intensity has the lowest value and is homogeneous within better than 9%; the
background in this region likely represents an isotropic component with mean in intensity in the (0.16-2.7 keV energy range) of about 19
kev/cm**2/kev/steradian, 2.5 times more than the value extrapolated from higher energy measurements.