A method for determination of at least one of the triglyceride molecular species in a biological sample comprising the subjecting sample to lipid extraction to obtain a lipid extract and subjecting the resulting lipid extract to 2D electrospray ionization tandem mass spectrometry with neutral loss scanning of all naturally occurring aliphatic chains and contour analysis of 2D intercept peaks. A connecting unit is provided for connecting a register circuit in a certain column to a register circuit in another column, and an operation is performed for holding, in register circuits through the connecting unit, digital signals obtained by performing AD conversions of analog electric signals at different timings in one horizontal synchronizing period. Three scan lines are formed between every two rows of sub-pixels. Events that are known to the performance monitoring unit such as instruction retired, TLB misses, may be counted at the same time using a number of performance monitoring counters in the performance monitoring unit. The second buffer subsection includes a plurality of buffer units of a second buffer unit size wherein the second buffer unit size is larger than the first buffer unit size.