What is a Mixed Chart?
The mixed chart is a visualization that combines the features of the bar chart and the line chart. The mixed chart displays the data using a number of bars and/or lines, each of which represent a particular category. A combination of bars and lines in the same visualization can be useful when comparing values in different categories, since the combination gives a clear view of which category is higher or lower. An example of this can be seen when using the mixed chart to compare the projected sales with the actual sales for different time periods.
Source:
https://docs.tibco.com/pub/spotfire/7.0.1/doc/html/comb/comb_what_is_a_combination_chart_.htm