![Graph of Speed vs. Altitude for U-2 high-altitude airplane, region depicting Coffin Corner. Stall and Mach limits for one particular gross weight clarified in color. Note that the operational envelope gets narrower if the plane is more heavily loaded.](http://upload.wikimedia.org/wikipedia/commons/thumb/7/75/CoffinCornerU2.png/421px-CoffinCornerU2.png)
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