item_exposure_rate_final: exposure rates for each item, treating items administered in non-true segments as not exposed. Conceptually this will never exceed item_exposure_rate.
stim_exposure_rate: exposure rates for each stimulus.
stim_index: the stimulus index each item belongs to.
max_rate: target exposure rate for each theta segment.
title: the title of this plot panel.
color: the color for exposure rate bars. (default = blue)
color_final: the color for exposure rate bars, treating items administered in non-true segments as not exposed. (default = yellow)
color_stim: the color for stimulus groupings. (default = red)
color_threshold: the color for the target exposure rate bar. (default = dark gray)