Visualisation is pivotal for Science.
Unscientific colour maps like the rainbow (a.k.a. jet) colour map distort, hide, and falsify the underlying data, while often making the figure unreadable to colour-blind readers or when printed in black and white (see #endrainbow).
Scientific colour maps, like the colour maps devon, davos, oslo, and broc, are perceptually-uniform and colour-blindness friendly. These and a few more scientific colour maps can be downloaded and used freely below.
A MatLab function to produce (colour-blindfriendly) colour arrays to colour multiple lines or markers in a plot.