Thank you,
I am having an issue where my x-axis (on a vbar chart) is time.
(for illustrative purposes, imagine wanting a reference line on each holiday, but the x-axis simply displayed the month, and the underlying data columns were date date9. and sales).

I can add reference lines by matching the date format of the x-axis, but I lose the reference lines if I change the interval of the x-axis.
If I display the data by day, I can have all 11 reference lines, but if I change the x-axis to month values=(date to date by month), I lose the reference values, since those exact dates are no longer tick marks.

I am trying interval=, tickvalueformat=, and even x2axis with refticks, and many other options, but I cannot figure out how to have reference lines that correspond to my x axis data, but also display a graph that does not squeeze every individual date.

The only reason I want to change the x-axis to months is to make it legible, since each individual date is displayed en mass.