  Positron spectrum from inverse beta decay reaction on proton was measured in
1988-1990 as a result of neutrino exploration experiment. The measured spectrum
has the largest statistics and lowest energy threshold between other neutrino
experiments made that time at nuclear reactors. On base of the positron
spectrum the standard antineutrino spectrum for typical reactor fuel
composition was restored. In presented analysis the partial spectra forming
this standard spectrum were extracted using specific method. They could be used
for neutrino experiments data analysis made at any fuel composition of reactor
core.
