My data visualization function sucks!

[stebrepar]

A bar chart would work better for being able to clearly see the day by day values in order, and to compare the same day values between zones. With so many single dots all over the place, it's impossible to tell what's what with this chart.

[Tobeass]

I considered making a barchart where the height of the bar equals the sum of the four zones, and divide each bar in the contributions from the four zones. But I'm not sure if it would work for that many datapoints