Implementation of the 'viridis' - the default -, 'magma', 'plasma',
'inferno', and 'cividis' color maps for 'R'. 'viridis', 'magma', 'plasma',
and 'inferno' are ported from 'matplotlib' , a
popular plotting library for 'python'. 'cividis', was developed by Jamie R.
Nuez and Sean M. Colby. These color maps are designed in such a way that
they will analytically be perfectly perceptually-uniform, both in regular
form and also when converted to black-and-white. They are also designed to
be perceived by readers with the most common form of color blindness (all
color maps in this package) and color vision deficiency ('cividis' only).