Before revision:  Furthermore, it is possible to further increase the accuracy of the solutions in 2D by increasing the support of the integrals containing the bubble functions .
After revision:  Furthermore, it is possible to further increase the accuracy of the solutions in 2D with a simple modification of the RFB method. We provide analysis to show how the modified-RFB method mitigates the pollution error. The analysis gave rise to a fourth order accurate finite difference scheme that uses seven-point stencil .