Let $D$ be an $S_n$ symmetric $Q$-divisor on $\bar{M}_{0,n}$. This function reduces a symmetric divisor $D$ by the gcd of its coefficients in the standard basis. This gives a canonical representative of each nonzero ray in $Pic(\bar{M}_{0,n})_Q^{S_n}$.
i1 : D=symmetricDivisorM0nbar(6,288*B_2+144*B_3)
o1 = 288*B + 144*B
2 3
o1 : S_6-symmetric divisor on M-0-6-bar
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i2 : scale(D)
o2 = 2*B + B
2 3
o2 : S_6-symmetric divisor on M-0-6-bar
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The object scale is a method function.