Left panels: noise for two bolometers as a function of ring number. Black dots are from the 2013 data release; blue dots are from the 2015 release. The change in the absolute noise level is due to a change in the time-response deconvolution between the two data releases. Right panels: histograms of the noise. The numbers in the boxes give the width of the histogram at half maximum as a percentage of the mean noise level. For most bolometers, the FWHM in the 2015 release is less than 1% (Planck Collaboration VIII 2016).