See labels above those numbers: FULL - ALS out
ALS = Approach Lighting System
If the ALS is fully working, the required RVR or visibilty is 45m - if the ALS is not working (i.e. "out") the required visibilty/RVR has to be 1200m
Reason being - the very intense approach lights leading to the runway threshold can be seen from over a thousand meters farther away than the regular runway lights, in fog, snow, or other heavy precipitation.