Don't use 2-digit exponent format for ticklabels when unnecessary. * graphics.cc (calc_ticklabels): New boolean variable is_2digit_exp. Cycle through ticklabel values using log10 to determine if maximum exponent is greater than or equal to 10. As soon as this condition is found set is_2digit_exp to true and break out of loop. Within ticklabel formatting loop, only print leading '0' if is_2digit_exp is true and the current exponent to be printed is less than 10.

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