Temperature values in the data are represented by the same plot symbol in a different color. The example also shows how default symbol sequencing provides a default plot symbol if a plot needs more plot symbols than are defined. Assign the libref and set the graphics environment. Because no color is specified, the symbol is rotated through the colors list. Because the plot needs a fifth symbol, the default plus sign is rotated into the colors list to provide that symbol.
L specifies a new line and left-justifies the second string under the first.
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