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Internal scaling function to display proper x-axis labels.
get.scale(scale)
An integer corresponding to the number of days between each x-axis tickmark.
Scale to be adjusted on x-axis. Can be d (day), w (week (default)), f (fornight), m (month).
d
w
f
m
Pierre-Yves Boelle, Thomas Obadia
Builds the x-axis labels corresponding to a human-friendly level (day, week...).