651823.fig.005a
(a) Simple average (1 sec)
651823.fig.005b
(b) 150 Hz sampling and average (1 sec)
Figure 5: Comparison of two kinds of monitoring data. (a) Raw data on 25th March 2011 sampled by 18 kHz and averaged for 1 second. Small drift of about 0.003 mV is due to the limit of circuit performance. (b) The same raw data through resampling by 150 Hz and averaged for 1 second.