Corrigendum: "Quality assurance of VMAT on flattened and flattening filter free accelerators using high spatial resolution detector". Issue 8 (18th July 2020) - Matar, Fatima S.; Wilkinson, Dean; Davis, Jeremy; Biasi, Giordano; Causer, Trent; Fuduli, Iolanda; Brace, Owen J.; Stansook, Nauljun; Carolan, Martin; Rosenfeld, Anatoly B.; Petasecca, Marco