The present invention provides methods to be used in seismic data processing to address problems encountered during data acquisition. The decorative material includes at least a substrate, a low-gloss pattern ink layer formed on part of the substrate, and a surface protective layer which is present on and contacted with the low-gloss pattern ink layer so as to cover a whole surface including both a region where the low-gloss pattern ink layer is formed and a region where no low-gloss pattern ink layer is formed. Since both ADC and TDC functions are desired in most measurement systems, a dual-function digitizer is not only more attractive from a system integration perspective but is also more marketable. A hydraulic pump installed on the distant end of an electrically heated composite umbilical also provides artificial lift for the produced hydrocarbons. One of the first and second light sources is selected so that information recording or reproduction is performed by converging a light beam emitted from the selected one of the first and second light sources on an optical recording medium via the dichroic element, the phase plate, and the objective lens.