Keep in mind however, that either GURPS playtesters goofed with that Tech level progression, or they decided deliberately to violate the one to one conversion aspect of Traveller Tech levels to GURPS tech levels. Specifically, you can have Meson Technology at Traveller Tech level 11, but not at GURPS traveller tech level 9 (which includes Traveller Tech level 11). Either they should have stated that GURPS Tech is Traveller tech levels 9 & 10, and made GURPS traveller Tech 10 = to 11, 12, & 13, or they should have introduced a "Late TL 9" Meson gun platform for GURPS TRAVELLER: STARSHIPS.