Fig. 4
a Well depths and feed zones visualized as colored squares. On the top of each well is the year of the first extraction record. b Violin chart showing the distribution of the production rates. The widths are proportional to the number of data points with the given flowrate. The median, Q1 and Q3 are presented by white lines. The gray block shows the range of the whole production. The bottom of the square is set by the Q1 of the less productive well. The top is set by the Q3 of the most productive well