Terra Cognita I: The lowest (known) mass squared splitting

We summarize the results presented in the parallel session Terra Cognita I, focused on discussing neutrino oscillations driven by the lowest mass square splitting. Two sessions were dedicated to discuss: a) experimental efforts to improve the precision of astrophysical factors, solar neutrinos and long baseline reactor antineutrinos measurements, b) phenomenological and theoretical role of the solar oscillation parameters and the possible subleading effects.