[BUG] Multiple Data sets - Time series joins them up

## Describe the Bug

When plotting multiple science data files together (e.g. 3 separate science files from different times), the different data sets are joined together by a line. This makes it very hard to distinguish between the data sets, and also makes it hard to know what is data collected by MAG, and what is just MATLAB filling in the gaps. Please can the separate data sets be plotted with a gap between them instead.

## To Reproduce

Information to reproduce the behavior:

1. Which data set? FEE03 Test plan ARR6
2. Which processing settings? HelioSwarm
3. Step-by-step description, if applicable.
4. What is the error?

Different data sets joined together

## Additional Information

* Version: v9.1.2
(Output of `mag.version()`)