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The horizontal axis plots frequency in gigahertz, ranging from 1 to 5 in increments of 1, while vertical axis plots penetration depth, delta sub p in centimeters, ranging from 0 to 50 in increments of 10. The graph plots three curves which start on the vertical axis, move downwards in a steep slope and turn right on approaching the horizontal axis. The curve at the bottom for pure water starts at a penetration depth of 10 centimeters for a frequency of 1 gigahertz, and clocks 3 centimeters for 2 gigahertz, 2.5 centimeters for 3 gigahertz, 2 centimeters for 4 gigahertz, and 1 centimeter for 5 gigahertz.

The curve in the middle for food with 50 percent water starts at the penetration depth of 19 centimeters for frequency of 1 gigahertz, and clocks 5 centimeters for 2 gigahertz, 4 centimeters for 3 gigahertz, 3 centimeters for 4 gigahertz, and 2 centimeter for 5 gigahertz. And the curve on top for food with 20 percent water starts at the penetration depth of 49 centimeters for the frequency of 1 gigahertz, and clocks 12 centimeters for 2 gigahertz, 6 centimeters for 3 gigahertz, 4 centimeters for 4 gigahertz, and 3 centimeter for 5 gigahertz.

A vertical line is drawn through the three curves at microwave oven frequency of 2.45 gigahertz, marking the penetration depths of 2.7 centimeters for pure water, 4.5 centimeters for food with 50 percent water, and 8 centimeters for food with 20 percent water. The temperature is labeled 20 degree C. A rectangle is marked between penetration depths of 24 and 34 centimeters, and frequency range of 2.8 to 4.2, representing chocolate bar. 95 percent of energy is absorbed in the top layer of this bar for a depth of 3 delta sub p.