NPCs composing that spawngroup :

a_newly_created_sentry (100%)

NPCs spawning around that spawngroup :
(Max range : 100)

sleeper_15, range=2 (-684,-46,111)

sleeper113016, range=32 (-685,-15,111)

sleeper113017, range=63 (-685,16,111)

sleeper113052, range=96 (-687,-143,111)

sleeper113053, range=65 (-686,-112,111)

sleeper113054, range=33 (-686,-80,111)