Framed Parabolic sheaves on a trinion

We consider for structure groups $\mathrm{S}\mathrm{U}(n)\subset \mathrm{S}\mathrm{L}(n,\mathbb{C})$ a densely defined toric structure on the moduli of framed parabolic sheaves on a three-punctured sphere, which degenerates to an actual toric structure. In combination with previous degeneration results, these extend to similar moduli for arbitrary Riemann surfaces.