Type of graph
"To illustrate its poll, YouGov issued this image, which resembles the 20th century charts which terrified Londoners by showing the damage a Soviet nuke would inflict upon their city."
That is the description.
Although it may not be as you want it, it does state why and in that context it is accurate as a nuclear bomb would have an effect decreasing with increasing radius.
Biting the hand that feeds IT
