Example CCFs for four pulsating stars as labeled. The color traces the pulsation phase. KN Cen is a long-period, high-amplitude type-I Cepheid. The others are prototypes of their respective pulsating star classes. CCF shape variations follow a characteristic pattern for type-I Cepheids. RR Lyrae stars are hotter and feature shallower CCFs with very large amplitudes and line asymmetry, whereas W Virginis stars can exhibit signatures of shock phenomena at specific phases, including blue-shifted emission features and line splitting.