Log(L_H2) vs. Log(L_bol). Results from the current survey (black hexagons) are combined to those obtained from previous works (Caratti o Garatti et al. 2006, 2008) as labelled in the upper left corner. The red dashed line indicates the previous fit from Caratti o Garatti et al. (2006), which includes only low-mass jets and excludes the four low-mass outliers. The blue dashed line shows the best linear fit resulting from the whole sample of HMYSOs. The black dash-dotted line shows the best linear fit resulting from HMYSOs, excluding the five high-mass outliers.