  A new two-dimensional procedure for extrapolation of the values of matter,
neutron, and proton radii obtained in no-core shell model (NCSM) calculations
to infinite size of its basis is proposed. A relationship between the radii is
used as an additional test. Together with the JISP16 potential, which is
frequently used in NCSM calculations of the radii, the Daejeon16 potential is
applied for these purposes for the first time. Halo nucleus 6He is the object
of studies. The small spread of radii values, successful testing using
relationship between the values of these three radii, and reasonable agreement
between the obtained results and experimental data as well as the results of
other advanced ab initio calculations demonstrate the high efficiency of the
developed approach and, therefore, good prospects for its application. The
performed investigations and analysis of the results of other studies indicate
that the halo of 6He has a large size 0.7 - 0.8 fm.
