def METHOD_NAME():
    """Build docstring containing RST-formatted table of constants."""
    lines = ['The following constants are available:\n']
    rows = []
    for key, const in constants.items():
        rows.append([key, const.value, const._unit_string, const.name])
    table = Table(rows=rows, names=('Name', 'Value', 'Unit', 'Description'))
    table['Value'].info.format = '14.9g'
    f = io.StringIO()
    table.write(f, format='ascii.rst')
    lines.append(f.getvalue())
    return '\n'.join(lines)