The remaining techniques (APs 2‐5) were slight variations of the first one. The changes were primarily limited to attempts to improve target coverage and dose homogeneity. Since we require the entirety of the GTV to be covered by the prescription isodose, AP 2 and 3 included GTV as a separate target, with slightly higher dose goals. If GTV coverage were to improve, that would help to avoid excessive renormalization and thus improve dose homogeneity. In AP 4, a repeating goal was added for the secondary PTV (PTV_56 + 1 mm) in an attempt to achieve better coverage of the secondary target. For AP 5, in addition to having the GTV goals, two new tuning structures were created around the PTVs. The first one was a 1 cm expansion of PTV_70 and it was assigned a high priority maximum dose goal of 73.5 Gy. The second one was a part of PTV_56 at least 1 cm away from PTV_70. It was assigned a high priority maximum dose goal of 60 Gy. In the same technique, an additional larynx goal was introduced (maximum DVH dose of 35 Gy to 75% of the volume). All five techniques were applied to each of 10 cases, resulting in 50 autoplans.