Figure 7
Average visibility results. The ranking shows the relationship between the groups with respect to contrast. Each blue circle represents a tested condition and they are ordered according to their ranking, with the least preferred condition on the left. The x-axis represents the rating of each condition, expressed as the mean number of votes, i. e. mean visibility of the disks with given setup. The percentages indicate the probability that an average observer will regard the condition on the right as better than the condition on the left. If the line connecting two conditions are red and dashed, there is no statistical difference between this pair of conditions (\(H_0\) could not be rejected at 0.05 level). The small-font number in square brackets indicates the p value of the t test between both conditions (without compensation for multiple comparisons).
