Fig. 2: Measured rate at each retarding energy for KNM1 (refs. 17,18) and KNM2 campaigns.
From: Direct neutrino-mass measurement with sub-electronvolt sensitivity
a, Data points with statistical error (multiplied by a factor of 50) and best-fit model (blue and grey lines) individually shown for each campaign. The count rates are summed over all the detector rings. The graph illustrates a reduced background rate, higher signal strength and overall higher statistics (smaller error bars). The fit description is given in equation (2). b, Normalized residuals for the fit (blue line) to the data from KNM2. The shaded areas indicate statistical and total uncertainties. The contribution of systematic uncertainties is derived with the covariance matrix method, explained in the main text. c, Data points with statistical error (multiplied by a factor of 10) for the 12 detector rings in the KNM2 campaign. The turquoise lines show the simultaneous fit to all the data points. d, Normalized residuals for the fit (turquoise line) to the data of the (exemplary) third detector ring. e, Total measurement time at each retarding energy for the KNM1 and KNM2 campaigns.
