I have a line chart in numbers, with a standard y-axis ranging from 0-100% and a logarithmic axis ranging from 0.1-1000. I have 3 sigmoidal curves on the chart, 2 starting at 100% and one starting at 65%. I was wondering how I can add a horizontal line from 50% of the starting percentage, running across to the corresponding line on the graph and then running vertically down from this point to the x-axis.
Cheers
Cheers
