| #### D.6.13.21 spgamma Procedure from library `gmssing.lib` (see gmssing_lib). Usage: spgamma(sp); list sp Return: number gamma; gamma invariant of spectrum sp Example:
    LIB "gmssing.lib";
    ring R=0,(x,y),ds;
    list sp=list(ideal(-1/2,-3/10,-1/10,0,1/10,3/10,1/2),intvec(1,2,2,1,2,2,1));
    spprint(sp);
    ==> (-1/2,1),(-3/10,2),(-1/10,2),(0,1),(1/10,2),(3/10,2),(1/2,1)
    spgamma(sp);
    ==> 1/240

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