Distribution of the number of observations per Cepheid. The red histogram shows the available number of observations (N_obs) of all Cepheids in VELOCE. The blue histogram shows the number of measurements used to fit Cepheid RV curves (N_obs,fitted). The bin edges are identical for both histograms and logarithmically spaced. The first 8 bins of the red histogram are shown individually to improve readability; a threshold of at least 9 observations was used to fit pulsational models (Sect. 3.3.1). Differences between the blue and red histograms at N_obs > 8 arise due to data selection for model fitting (e.g., in the case of binaries, Sect. 3.3) or additional signals preventing a reasonable fit (Sect. 4.3). The legend summarizes the median and total number of VELOCE observations per group.