we set <code>reverse = TRUE</code> and all <code>weight = 1</code> in the input data. So, for example, the first row of the data frame corresponds to y range <code><a href="https://rdrr.io/r/base/c.html">c(0, 1)</a></code>, the second <code><a href="https://rdrr.io/r/base/c.html">c(1, 2)</a></code>, and so forth. This gives us all the information we need to find the index of the rows of the input data that goes with the stratum the cursor is on. <em>Note:</em> It is necessary for the input data to be sorted