Tableau Conference 2018 | New Orleans | October 22-25 | …

Select Border and pick a medium gray color. Double-click the y-axis and select "Fixed" and set the "Fixed Start" to 40. Select the "Tick Marks" tab and select "Fixed" and set the fixed "Tick Interval" to 10. Double-click the x-axis and select "Fixed" and set the "Fixed Start" to .01. ................
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