By covering all aspect-ratios in one formula, Wheeler 1977 improves on Wheeler 1965 which gives one formula for w / h > 3.3 {\displaystyle w/h>3.3} and another for w / h ≤ 3.3 {\displaystyle w/h\leq 3.3} (thus introducing a discontinuity in the result at w / h = 3.3 {\displaystyle w/h=3.3} ).
Pre pokrytie všetkých aspektov do jedného vzorca, Wheeler 1977 vylepšuje Wheelera 1965 , kde jedna rovnica platí pre w / h > 3.3 {\displaystyle w/h>3.3} a druhá pre w / h ≤ 3.3 {\displaystyle w/h\leq 3.3} (čiže zavádza nespojitosť pre w / h = 3.3 {\displaystyle w/h=3.3} ).