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prominent diagonal band that runs from the upper left to the lower right) in the region of A and F stars (1-2 solar mass ) and extends to G and early K bright supergiants (early M if RV Tauri stars at minimum are included). Above the main sequence, the vast majority of stars in the instability strip are variable. Where the instability strip intersects the main sequence, the vast majority of stars are stable, but there are some variables, including the roAp stars and

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