def draw_root_strings(draw, instrument, text_top_area, image_width, palette):
    """Add the strings to the root finder image"""
    for string_num in list(range(instrument.number_of_strings)):
        string_pos_x = instrument.margin / 2 + instrument.nut_width / 2
        string_pos_y = text_top_area + string_num * (instrument.
            string_spacing / 4) + instrument.first_string_gap / 4
        draw.line((string_pos_x, string_pos_y, image_width, string_pos_y),
            palette.string_colour, width=int(instrument.string_width / 2))
    return draw
