Whisker Chart w. Tails

I am not sure what you need help with. Before, I had assumed that you already had the scatter chart plotted, and you just needed help adding error bars to the scatter chart data. Was I correct before, or do you really need help with the whole chart creation? Starting from scratch (and disregarding the background colors), here's how I would build a simple scatter chart with horizontal error bars:

1) Enter data into spreadsheet. Probably arranged something like:

previous (x) -- current (x) -- y value -- difference
1.5 -- 2.1 -- ?? -- =A2-B2
next entries copy D2 down

2) Insert chart
2a) Select current (x) and yvalue columns
2b) Insert -> Charts -> XY scatter chart -> markers without lines
2c) Hopefully, excel will correctly see that the data is arranged in rows. If not, Clock "switch row/column". If Excel completely fails to see the x and y columns correctly, then enter the source data dialog and fix the data series.
3) Add error bars (see help file in post #2)
3a) Select data series
3b) Layout->Error bars
3c) delete the vertical error bars
3d) Format horizontal error bars -> specify value -> use column D for the positive error bar values.

Where do you get stuck?