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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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gap> START_TEST("HAP library");
gap> x:=ReadImageAsWeightFunction(Concatenation(dir,"image2.1.2.eps"),3);;
gap> M:=x[1];
Regular CW-complex of dimension 2

gap> w:=x[2];
function( k, i ) ... end
gap> EulerIntegral(M,w);
32
gap> STOP_TEST( "tst.tst", 1000 );