All labels must meet the following specifications: (a)Layout - (1)For gasoline labels. The label is 3 inches (7.62 cm) wide * 21/2 inches (6.35 cm) long. The illustrations appearing at the end of this rule are prototype labels that demonstrate the proper layout. "Helvetica Black" or equivalent type is used throughout except for the octane rating number on octane labels, which is in Franklin gothic type. All type is centered. Spacing of the label is 1/4 inch (.64 cm) between the top border and the