This is an internal function, but can be used to better understand how line colors are handled within other plotting functions.
utils_line_color(x = NULL, line_color = NULL)color vector
(required, sequence) zoo object or time series list. Default: NULL
(optional, character vector) vector of colors for the time series columns. Selected palette depends on the number of columns to plot. Default: NULL
Other internal_plotting:
color_continuous(),
color_discrete(),
utils_color_breaks(),
utils_line_guide(),
utils_matrix_guide(),
utils_matrix_plot()