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It doesn't appear as though they are using density altitude but sea level altitude for the chart and recommending that for a more accurate reading you use DA. I guess if you want to do that then you would need this...
Density altitude from Pressure Altitude and International Standard Atmosphere temperature deviation
Density Altitude in feet = Pressure Altitude in feet + (120 x ISA deviation)
Of course you'll also need:
Outside Air Temperature
ISA temperature = 15°C - (1.98°C/1000ft x Altitude in feet)
I don't really think I would go through the trouble but someone might...
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