Google Sheets Column Width Bug

Stepped area chart does not support variable width of steps. But you can use the ordinary area chart like this:

The data provided to this chart was as follows. The first column was marked for "use as labels" when inserting the chart.

0.00    0
1.00    0
1.00    1
1.41    1
1.41    2
1.73    2
1.73    3
2.00    3
2.00    4
2.24    4
2.24    5
2.45    5
2.45    6
2.65    6
2.65    7
2.83    7

The idea is that each x value is repeated twice, and each y value is repeated twice, but they are half-step out of sync with each other. So every time we move down the rows, exactly one of two coordinates changes: x (horizontal segment) or y (vertical segment).

For the record, the formulas were =sqrt(floor(row()/2)) and =floor((row()-1)/2) and the chart options were

The cause of the error is that the firstSheet doesn't have the same number of columns than the currentSheet.

You could avoid this error by checking if firstSheet.getMaxColumns() >= currentSheet.getMaxColumns()