Here a similar doubt.
"For altitudes up to approximately 10,000 feet, the flaps-up amber band functions just like the flaps-down amber band described above, with the top of the amber band representing full maneuver capability. [...] Above approximately 20,000 feet, the top of the amber band shows the speed that provides 1.3g maneuver capability to low speed buffet (or an alternative approved maneuver capability as preset by maintenance)."
What does it mean with "full maneuver capability"? How is it different from the 1.3g maneuver capability at the top of the amber band at 20.000ft?