# Source code for fontTools.ttLib.tables._v_m_t_x

    from fontTools import ttLib

    superclass = ttLib.getTableClass("hmtx")

    class table__v_m_t_x(superclass):
        """Vertical Metrics table

        The ``vmtx`` table contains per-glyph metrics for the glyphs in a
        ``glyf``, ``CFF ``, or ``CFF2`` table, as needed for vertical text
        layout.

        See also https://learn.microsoft.com/en-us/typography/opentype/spec/vmtx
        """

        headerTag = "vhea"
        advanceName = "height"
        sideBearingName = "tsb"
        numberOfMetricsName = "numberOfVMetrics"