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there is no object (e.g. a utensil or a cloth) covering them.
Even a thin film of water may make the controls difficult to
operate.
Choosing the Right Cookware
Do not use cookware with jagged edges or a curved base.
Make sure that the base of your pan is smooth, sits flat
against the glass, and is the same size as the cooking zone.
Always centre your pan on the cooking zone.