Trajectory plots on white background: White line for BepiColombo is invisible

[dmueller3000]

I wanted to make an orbit figure for a report, with a white background. It seems that the line color for BepiColombo is always white, which makes it invisible in this case. --> Could you adapt the line colors so they are all visible both on black and white background? If easy, it would also be appreciated to increase the size of the dot and the line thickness for each body to increase visibility if the Parker spiral is plotted as well. Thanks a lot!