Create the ColsHeader header template. The DEFINE HEADER statement creates the
header ColsHeader, which is specified by the preceding COLS_HEADER= style
attribute. The TEXT statements specify the text of the header by using dynamic
variables that represent label variables and names. The first TEXT statement uses an
expression to determine whether a label is assigned to the variable. If there is no label,
the next TEXT statement is used, which specifies the row name. In this example there is
a column label, so in the output, _COL_LABEL_ resolves to ...
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