Finding GPQs. II. Sp. observations of |b|<20{deg} QSOs

Quasars behind the Galactic plane (GPQs) are important astrometric references and valuable probes of Galactic gas, yet the search for GPQs is difficult due to severe extinction...银道面后方类星体（Galactic Plane Quasars, GPQs）既是重要的天体测量参考源，也是探测银河气体的宝贵探针；然而受严重星际消光影响，对这类类星体的搜寻工作始终极具挑战……