Source detection from actual LOFAR observations from the Boötes field (Dataset II and III) with LEAP (the left column) and CLEAN (the right column). Panel a: LEAP and CLEAN reconstruction from single band visibility measurements at frequency 145.8 MHz with 72 integration times. Panel b: LEAP and CLEAN reconstruction from visibility measurements within 8 sub-bands at frequencies from 145.8 MHz to 146.5 MHz with 9 integration times.