Four combinations of standard coronal structures explored. Panel a: AR equal to 0% and COs varying between 10 and 100%; panel b: AR equal to 30% and COs varying between 7 and 70%; panel c: AR equal to 40% and COs varying between 6 and 60%; panel d: AR equal to 50% and COs varying between 5 and 50%. For all the combinations, the FLs are allowed to vary between 0 and 2% of the CO area fraction. Increasing CO coverage is represented by darkening color, while increasing FL fraction is represented by increasing symbol size. The overplotted numbers are the observed values of ɛ Eri and are chronologically ordered.