The following suboptions may be used within the mgroups(), mlabels(),
    collabels(), eqlabels(), varlabels(), and stats(, labels()) options:

    none suppresses the printing of the labels or drops the part of the table
        heading to which it applies.

    prefix(<string>) specifies a common prefix to be added to each label.

    suffix(<string>) specifies a common suffix to be added to each label.

    begin(<string>) specifies a prefix to be printed at the beginning of the
        part of the table to which it applies. If begin is specified in
        varlabels() or stats(,labels()), the prefix will be repeated for each
        regressor or summary statistic.

    end(<string>) specifies a suffix to be printed at the end of the part of
        the table to which it applies. If end is specified in varlabels() or
        stats(,labels()), the suffix will be repeated for each regressor or
        summary statistic.

    last specifies that the last occurrence of the end()-suffix in
        varlabels() or stats(,labels()) be printed. This is the default. Use
        nolast to suppress the last occurrence of the suffix.

    span causes labels to span columns, i.e. extends the labels across
        several columns, if appropriate. This suboption is relevant only for
        the mgroups(), mlabels(), eqlabels(), and collabels() options. The
        @span string returns the number of spanned columns if it is included
        in the label, prefix, or suffix. A LaTeX example:

        . estout ..., mlabels(, span prefix(\multicolumn{@span}{c}{)
        suffix(}))

    erepeat(<string>) specifies a string that is repeated for each group of
        spanned columns at the very end of the row if the span suboption is
        specified. This suboption is relevant only for the mgroups(),
        mlabels(), eqlabels(), and collabels() options. If the @span string
        is included in string it will be replaced by the range of columns
        spanned. A LaTeX example:

        . estout ..., mlabels(, span erepeat(\cline{@span}))

    lhs(<string>) inserts string into the otherwise empty cell in the left
        stub of the row of the table heading to which it applies. This
        suboption is relevant only for the mgroups(), mlabels(), eqlabels(),