What is the best way to represent the contrast between projected and real values visually?

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One option could be to use a dual-axis chart. The first axis can represent the projected values, while the second axis can represent the real values. You can use different colors or markings to differentiate between two axes. Another option is to use a stacked bar chart, where one section shows the projected values and another section shows the real values. The difference between the two bars can represent the contrast between projected and real values. Additionally, a line chart can also be used to showcase the difference between projected and real values. The projected values can be represented as a solid line, while the real values can be represented with a dashed or dotted line to show the contrast.