NPCs composing that spawngroup :

greater_scalebone (25%)

greater_scalebone (25%)

greater_skeleton (25%)

greater_skeleton (25%)

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

swampofnohope_139, range=15 (1322,639,-3)

greater_skeleton (100%)

swampofnohope_217, range=44 (1352,644,-1)

swampofnohope_218, range=75 (1242,598,-6)

swampofnohope_223, range=89 (1398,648,2)

greater_scalebone (100%)

swampofnohope_224, range=76 (1387,637,2)

greater_scalebone (50%)
greater_scalebone (50%)

swampofnohope_225, range=58 (1363,655,-1)

greater_scalebone (50%)
greater_skeleton (50%)