Fig. 19.
I-V (upper panel), K-S (middle panel), and F-T (bottom panel) significance tests to search for a constant period spacing in NGC 1501. The tests are applied to the pulsation periods in Table 12 that are marked with an asterisk. The three tests indicate clear signals of two constant period spacings of ∼11.9 s and ∼20.1 s. See text for details.
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