Egy közelítő polinom a képletre, s y= 2-30 tartományban az eredeti jelöléssel :
=HA(y<2,5;2,841917706+7,795306221*y+0,8595481307*y^3-5,157288784*y^2;
HA(y<3;26,50133406-20,59599340*y+6,199231066*y^2-,6546545160*y^3;
HA(y<3,5;9,180143700-3,274803043*y+,4255009460*y^2-,1312894713e-1*y^3;
HA(y<4;12,33789484-5,981446882*y+1,198827757*y^2-,8677911960e-1*y^3;
HA(y<5;8,964852916-3,451665435*y+,5663823953*y^2-,3407533947e-1*y^3;
HA(y<10;5,145748507-1,160202789*y+,1080898660*y^2-,3522504180e-2*y^3;
HA(y<20;1,666226449-,1163461718*y+,3704204313e-2*y^2-,4298212323e-4*y^3;
HA(y<=30;1,581306515-,1036081818*y+,3067304811e-2*y^2-,3236713154e-4*y^3;
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