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The column headings from left to right are material, relative permittivity epsilon sub r and dielectric strength, E sub d s. The table information is as follows:

- Material, air at sea level. Relative permittivity, epsilon sub r, 1.0006. Dielectric strength, E sub d s, 3.

- Material, petroleum oil. Relative permittivity, epsilon sub r, 2.1. Dielectric strength, E sub d s, 12.

- Material, polystyrene. Relative permittivity, epsilon sub r, 2.6. Dielectric strength, E sub d s, 20.

- Material, glass. Relative permittivity, epsilon sub r, 4.5 to 10. Dielectric strength, E sub d s, 25 to 40.

- Material, quartz. Relative permittivity, epsilon sub r, 3.8 to 5. Dielectric strength, E sub d s, 30.

- Material, bakelite. Relative permittivity, epsilon sub r, 5. Dielectric strength, E sub d s, 20.

- Material, Mica. Relative permittivity, epsilon sub r, 5.4 to 6. Dielectric strength, E sub d s, 200.