The typical pattern and trimming illustrations show that the V5X5P resistor has 16 trimming points, the V15X5P has 20 and the V15X10P has 21. These trimming points are arranged around the chip periphery and are clearly indicated. Trimming to the desired resistance value and tolerance is accomplished by cutting the trim points, thereby producing specific incremental changes in the chip's resistance value relative to the original prevalue; up to + 20 % for the V5X5P, + 30 % for the V15X5P, and + 50 % for the V15X10P (not all trim points need be used; the R necessary to adjust the pre-value to the desired final value dictates which trim points neet to be used).