assigned purely from examination of the spectrum.

A number of different luminosity classes are distinguished, as listed in the table below.

Marginal cases are allowed; for example, a star may be either a supergiant or a bright giant, or may be in between the subgiant and main-sequence classifications.In these cases, two special symbols are used between the two luminosity classes:
* A slash (/) means that a star is either one class or the other.
* A hyphen (-) means that the star is in between the two classes.

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