Long description

A boxplot with a horizontal scale with an arrow head, pointing right, at the right-hand end. It is labelled pence per kilowatt hour. The scale starts just before the first marked point of 3.74 and is then marked in four intervals of 0.02, ending with 3.82. The boxplot is drawn above and parallel to the line. The first whisker starts at the lower extreme, level with 3.74.The box starts at the lower quartile, 3.756 and ends at the upper quartile, 3.802. Within the box but nearer the right-hand end is a vertical line indicating the median at 3.790. The second whisker starts at the midpoint of the right-hand end of the box and stretches to 3.818, as far as the upper extreme.