Figure improvements for clarity and accessibility - Add at will

[ForensicBMechE]

Some suggestions for the final versions of the figures, especially the ones covering much data from many devices:

• Whenever using colors (and please do so) also use:
  • line patterns, or at least make sure the colors are also sufficiently contrasting in grayscale,
  • marker shapes and filled vs. non-filled markers.
• Figures with same subsets: put data in same order.
• Use identical axes limits in similar figures.
• User thinner lines, they now overlap much, hiding maybe too much detail.
• Can we make the device descriptions clearer and more consistent?