7.8 Data visualization Bar and column charts (multiple bars) Alternating light and dark bars for bar charts makes it difficult to compare data . Shade bars from lightest to darkest to make comparison easier. Multiple Bar Char t Title Subtitle goes here 00 00 00 00 00 00 00 L abel L abel L abel S ource: Aliquam auctor nisi vitae quam tincidunt id auctor lorem fringilla . Data set 1 Data set 2 Data set 3 Data set 4 Multiple column char t title Subtitle goes here Data set 1 Data set 2 Data set 3 Data set 4 00 00 00 00 00 00 L abel L abel L abel S ource: Aliquam auctor nisi vitae quam tincidunt id auctor lorem fringilla .