Correction of margins in voltage decay analysis in PCC1 on 60A Notebook

I noticed one inconsistency with the analysis. So far in the notebook, the margins in the voltage decay and voltage smoothness analysis were displayed 1 s after the PM timestamp. In the analysis, voltage decay is analyzed 1 s after the PM timestamp, while voltage smoothness is analyzed 2.2 s after the PM timestamp. Therefore, I have corrected the margins in voltage smoothness plots.