code: def from_dynacRepr(cls, pynacRepr):
          
          L = float(pynacRepr[1][0][0])
          B = float(pynacRepr[1][0][1])
          aperRadius = float(pynacRepr[1][0][2])
          return cls(L, B, aperRadius)
docs: Construct a ``Quad`` instance from the Pynac lattice element