The lateral rotators also oppose medial rotation by the gluteus medius and gluteus minimus. Most antenna rotators have two parts, the rotator unit and the controller. The Latissimus dorsi muscles aids the lateral rotators in transverse extension. Prism rotators use multiple internal reflections to produce beams with rotated polarization. Gobo rotators are metal frames designed to hold a gobo. Faraday rotators may be enhanced by the Zeeman effect. Potentially slow rotators have their rotation period estimated based on a fragmentary light curve. Other methods have been demonstrated, such as the use of Faraday rotators and liquid crystals. Such techniques are now widely used to analyse high-degree NRP in rapid rotators. This makes "Los Molinos" one of the top 200 slow rotators known to exist. This makes "Leona" one of the Top 100 slowest rotators known to exist. Crown stopped manufacturing the rotators in late 2000. Also "see Potentially slow rotators" for minor planets with an insufficiently accurate period (). Only five of the 34 could be described as fast rotators.