In order to separate these two roots, an additional, slightly oblique view is indicated. 'SLOB' is an acronym for Same/Lingual-Opposite/Buccal and refers to the direction of the incoming X-ray beam as an aid in identification of roots of multirooted teeth. The root on the radiograph closest to the incoming X-ray beam is the more lingual root. When the radiograph is taken with the X-ray beam directed slightly from caudally, the mesiopalatal root will be projected distally to the mesiobuccal root.