1-2-3 would allow you to plot a function on your graphs. Something that I haven't seen since. The solution now is to build a range and values, but that just a

1-2-3 would allow you to plot a function on your graphs. Something that I haven't seen since. The solution now is to build a range and values, but that just adds one extra column of data to massage versus having a reference line covering the domain and range of that particular graph.