Clustering of YSOs south-west of the ONC (Haro4-145 cluster) shown by a 7.5′ × 7.9′ VISTA 3-color composite, in Galactic coordinates. The cluster harbours at least six protostars (yellow symbols) and nine disk candidates (blue squares). There are three more disk candidates visible in the image a bit more scattered. The two new extra protostar candidates from Sect. 3.3 are the two yellow circles, while previously known protostar candidates are shown by diamond symbols. The source at the bottom right is the new Class 0 candidate, only detected as a point-source in Herschel/PACS. The cloud structure (region of higher dust column-density) gets visible in this NIR VISTA image. The slightly reddish illuminated cloud, containing the YSOs, seems to be separate from the background cloud structure. Moreover, background sources like galaxies are visible in this image. The four cutouts (50″ × 50″) on the right show zoom-ins on four protostar candidates in this region (see text).