The following refinements would make reading and comparing plots easier:
adjust y-axis to always start from 0 so comparison of plots across different time windows or fields are straightforward
use symbols to indicate data points (in addition to the line) - sometimes data points are on straight lines and this makes it difficult to derive the granularity of the plot with regard to the time-axis.
add a title that specifies the field, run, and slicing parameters
The following refinements would make reading and comparing plots easier: