Fig. 5
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Fourier parameters of RV curves as a function of pulsation period and V-band LC shape: (a) ϕ21, (b) ϕ31, (c) ϕ41, (d) ϕ51, (e) ϕ61, (f) ϕ71, (g) R21, (h) R31, (i) R41, (j) R51, (k) R61, (l) R71. Yellow circles (calibrating sample) are used to produce the fits between 3.45 and 7 days (blue lines, see Sect. 4); red circles show metal-poor Cepheids; grey points above P > 7 days are ignored in the fit; violet points are metal-poor Cepheid outside the pulsation period range 3.4 to 7 days.
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