DESY-HERA. Measurement of the proton structure function F2 at low x and low Q**2. Data covers the Bjorken-x down to 6*10**-6 and Q**2 from 0.35 to 3.5 GeV**2. The data have been collected during the 1995 running. K is the kinetic factor Q**2/(4PI**2ALPHA).