NPCs composing that spawngroup :

greater_skeleton (50%)

scalebone_skeleton (50%)

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

kurn_1, range=88 (-53,144,4)

greater_skeleton (100%)

kurn_6, range=83 (-84,144,3)

kurn_9, range=97 (0,13,3)

scalebone_skeleton (100%)

kurn_18, range=33 (-70,30,-39)

Burynai_excavator (100%)

kurn_44, range=82 (-9,29,-116)

kurn_91, range=76 (-30,8,-39)

kurn_111, range=99 (-146,-18,-23)

Burynai_Excavator (100%)

kurn_113, range=85 (-114,-19,-22)

Burynai_burrower (50%)
Burynai_excavator (50%)

kurn_132, range=77 (-8,70,-39)

Burynai_excavator (50%)
Burynai_sapper (50%)

kurn_133, range=37 (-51,77,-39)

kurn_134, range=1 (-84,61,-39)

Burynai_Excavator (50%)
Burynai_Excavator (50%)

kurn_135, range=67 (-138,19,-39)

kurn_148, range=92 (-122,146,-39)

kurn_149, range=56 (-63,9,-30)

kurn_150, range=28 (-111,72,-39)

Burynai_excavator (100%)

kurn_151, range=47 (-106,18,-39)

kurn_152, range=72 (-88,-11,-30)

kurn_153, range=74 (-62,-10,-30)

kurn_160, range=67 (-53,1,9)

greater_skeleton (100%)

kurn_166, range=41 (-50,39,104)

kurn_179, range=90 (-170,31,4)

kurn_185, range=86 (-39,-12,104)

kurn_186, range=94 (-58,-30,104)

kurn_188, range=78 (-13,29,104)

greater_skeleton (50%)
scalebone_skeleton (50%)

kurn_192, range=90 (0,31,-39)

fingered_skeleton (20%)
thick_boned_skeleton (80%)

kurn_193, range=58 (-35,31,-39)

thick_boned_skeleton (100%)

#Crackling_Bones_189490, range=57 (-31,80,-39)

#Crackling_Bones (25%)
lesser_charbone_skeleton (75%)