Logarithm of the ratio between the flux at maximum and minimum light, i.e. 0.4 × the peak-to-peak amplitude, vs. mean I-band magnitudes for the pWVir (top), WVir (middle), and all other (bottom) objects. Stars with an IR excess are indicated by a green plus sign. Stars that show eclipsing or ellipsoidal variations according to OGLE are indicated by a blue cross. For the pWVir object -098 (MACHO 6.6454.5), a known eclipsing system, the location of the two components is also indicated by dark blue lines. The light blue lines indicate the location of two hypothetical binary systems, consisting of a pulsating component with a fixed amplitude and an increasingly fainter non-pulsating component. The pWVir stars that appear like normal WVir are enclosed by a box that is repeated in the middle panel.