I have a chart which is an imported graphic with a log scale. I want users to be able to slide the bars (named 1 and 2) to ascertain the value from the chart. I want to restrict the slide action to vertical and horizontal if possible. I have been trying to think laterally i.e. underlaying another graph to allow crosshairs to appear, but this hasn't yielded any real bouts of inspiration. Another thought was activating the shift key on the worksheet getting focus so you can only go vert and hor'. See attached file.