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Fig. 2

image

Positions of the null results (filled triangle) and δ-Scuti type variables discovered under the Nainital-Cape Survey (filled square). For comparison, positions of known roAp stars are also shown (open star). The solid lines show theoretical evolutionary tracks from the ZAMS (Christensen-Dalsgaard 1993). The dashed lines indicate the red and blue edges of the instability strip.

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