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How are optically pure, racemic, and scalemic related?

How are optically pure, racemic, and scalemic related?
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Optically pure compounds are those compounds when only one enantiomer exists. It is either dextrorotatory or leavorotatory. In case of optically pure compounds, enantiomeric excess is 100%. Racimic compounds are those compounds where (+) enantiomer and (-) enantiomer are present in equal amount (1:1). In case of racimic compounds, enantiomeric excess is 0%. Scalemic mixture is a mixture of enantiomers at a ratio other than 1:1. Enantiomeric excess of scalemic mixture is from 0% to 100%.

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