<p>also trying to fix some gaps like them not publishing what material they use for Tg135-140 dielectric. this relates to a huge gotcha in their quote system, where Nan Ya Plastics NP-155F is the material they assume for impedance control but FR-4 Tg135-140 is the default material for 4 and 6 layer boards *regardless* of whether you select an impedance controlled stackup. it doesn't switch it for you. if you don't select Tg150 manually, the impedance will be wrong on the manufactured board.</p>
