On the bulk block expansion for a monodromy defect

For a free–field flat monodromy defect, a formula for the finite part of the correlator is obtained as a double power series in $(1-x)$ and $(1-\text{ol}x)$ where $x$ and $\text{ol}x$ are lightcone coordinates. It takes the particular form of a series in $(1-x)$ with coefficients finite sums of hypergeometric functions of $1-\text{ol}x$ and is identified with a bulk block expansion. A simple expression for the coefficient of the $(1-x{)}^n(1-\text{ol}x{)}^m$ term is thereby found as an explicit function of the flux and dimension. Some typical examples are presented.A transformation allows the bulk block expansion to be written as an Appell $F_3$ function which has simplifying consequences.