Figure 4.

Raincloud plot of the isotope values and ratios found in tap water from the Netherlands

(A) δ²H and (B) δ¹⁸O isotope values in per mil (‰), and (C) ⁸⁷Sr/⁸⁶Sr. The raincloud (half-density) plot (top) enhances the traditional box-plot (middle) by highlighting multiple modalities (an indicator that groups may exist) and how distributions vary compared to the median and inner-quartile range. The half-dotplot (lowest), which is similar to a histogram, indicates the number of samples (number of dots) in each bin.