Left column: scatter plots of the HI masses of Virgo cluster galaxies from the VCC, shown with black crosses. The light grey points in the background are the HI detections of the AMIGA HI science sample. The solid blue line shows the MLE regression fit of this work and the dashed green line shows the HG84 relation. Right column: HI-deficiency of Virgo cluster galaxies from the VCC (diagonal hatching) compared to the AMIGA HI science sample (light grey). Top row: here the samples are compared based on D₂₅. Bottom row: here the samples are compared based on L_B.