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Given a graph $G$ on the vertex set $\{0,1,\ldots,n\}$ with the root vertex$0$, Postnikov and Shapiro associated a monomial ideal $\mathcal{M}_G$ in thepolynomial ring $R=\mathbb{K}[x_1,\ldots,x_n]$ over a field $\mathbb{K}$ suchthat $\dim_{\mathbb{K}}(R/\mathcal{M}_G)=\det\widetilde L_G$, where $\widetildeL_G$ is the truncated Laplacian of $G$. Dochtermann introduced the $1$-skeletonideal $\mathcal{M}_G^{(1)}$ of $\mathcal{M}_G$ which satisfies the propertythat $\dim_{\mathbb{K}}(R/\mathcal{M}_G^{(1)})\ge\det\widetilde Q_G$, where$\widetilde Q_G$ is the truncated signless Laplacian of $G$. In this paper wecharacterize all subgraphs of the multigraph $K_{n+1}^{a,1}$, in particular allsimple graphs $G$, such that$\dim_{\mathbb{K}}(R/\mathcal{M}_G^{(1)})=\det\widetilde Q_G$. Moreover, wegive examples of subgraphs $G$ of the complete multigraph $K_{n+1}^{a,b}$, inwhich the equality $\dim_{\mathbb{K}}(R/\mathcal{M}_G^{(1)})=\det\widetildeQ_G$ holds. We also provide a conjecture on the structure of a generalmultigraph satisfying the above-mentioned equality.

Standard monomials of $1$-skeleton ideals of multigraphs