- do not use linspace for x co-cordinates, use actual times of measurements to ensure that all features are reproduced on the plot
- get colours from plotutils
- change x axis to time from reference rather than absolute time to clean up the presentation
- explain what masses the horizon distance is for in the title
- change x axis major ticks to 1/2 hour intervals (human units)
- increase density of y axis ticks to help facilitate visual estimates of the values