In accordance with aspects of the disclosure, a method, apparatus, and computer program product are provided for wireless communication. In one aspect, a method includes positioning a bar between two surfaces so that one end is oriented towards one surface, and the other end is oriented towards another surface. The segment has an obverse bearing a second intaglioed pattern and has a shape complementary to the opening of the main body. In order to prevent the generation of redundant metric information, the information associated with the vector of metrics maybe placed into the trace records in several different space-saving formats. The reaction of esterification is carried out in stirred reactors at pressures below atmospheric pressure and temperatures from 30 to 90\xb0 C.