Ну так возьмите реальные координаты I5243, RISE479 (и я бы ещё добавил I18241, но формально это уже другая эпоха), и усредните 
Проверил, в G25 двое действительно оказались ближайшими к усреднению по кишапоштагцам (без S6), а вот ватинец RISE479 подальше улетел. За исключением этого схождение отличное.
Distance to: Hungary_MBA_Kisapostag:Average
0.02578507 HUN_EIA_Prescythian_Mezocsat_o1:I18241
0.02865253 SRB_Iron_Gates_MBA:I5243
0.03480920 Hungary_MBA_Kisapostag:S13
0.03910551 Hungary_MBA_Kisapostag:S10
0.03945221 Hungary_MBA_Kisapostag:S8
0.04013214 Hungary_MBA_Kisapostag:S45
0.04139406 CZE_Unetice_C:VLI050.A0101
0.04170216 HUN_Mako_EBA_o:I1502
0.04183956 Hungary_MBA_Kisapostag:S11
0.04535102 HRV_Jag_MBA:JAG78
0.04567489 HRV_Jag_MBA:JAG82
0.04803591 Hungary_MLBA_Transdanubian_Encrusted_Pottery:S19
0.04857992 Hungary_MBA_Kisapostag:S1
0.05163654 Bell_Beaker_HUN_EBA:I3528
0.05251320 SRB_Mokrin_EBA_Maros:MOK22
0.05450346 DEU_Tollense_BA:WEZ15
0.05570539 HRV_Jag_MBA:JAG58
0.05719378 CZE_LBA_Knoviz:I15959
0.05787729 Hungary_MBA_Kisapostag:S7
0.05886008 SRB_Mokrin_EBA_Maros:MOK21A
0.06005721 Scythian_HUN:I20743
0.06019825 Hungary_MLBA_Transdanubian_Encrusted_Pottery:S16
0.06034387 DEU_Tollense_BA:WEZ64
0.06064936 HRV_Jag_MBA:JAG06
0.06108782 Hungary_MLBA_Transdanubian_Encrusted_Pottery:S20
Hungary_MBA_Kisapostag:Average,0.130896571,0.140868429,0.091748286,0.063261857,0.081641714,0.019362857,0.004767571,0.017537857,0.029539,0.003228286,-0.001623857,-0.009441571,0.019177286,0.019463714,-0.015511,0.008807857,0.011734571,-0.000922857,0.002891143,0.017704857,0.012656143,0.001996286,-0.001672571,-0.042742857,-0.003917571