I have 4 sets of data that span the same period of time, 1 week, but all data
points were not collected at the same time, nor at the same interval. So, for
the first set of data I may have 400 points, while for the second set of data
- 700 points, etc. Time is on the X axis and the values are on the Y axis.
When plotting my 4 data sets, the plots do not coincide i.e. they are all
different lengths along the X axis.

Thanks in advance for any help