Fig. 7.

Systematic $m_{\nu }^2$ shift introduced by ignoring the non Gaussian detector response R(E) (computed for several lower thresholds on the delay with a step of 0.1 ms) caused by the application of both standard (light-blue) and matrix (blue) filters. In this study, in a conservative way, 0.1$e{\text{V}}^2$ was established as maximum acceptable absolute value of the systematic shift on $|m_{\nu }^2|$