Hi, 

The GW150914 example parameter file uses 8th order finite differencing and I need a 6th order version for comparison in terms of both accuracy and speed. Apart from changing the finite differencing orders from 8 to 6, and I assume GlobalDerivative automatically selects the correct dissipation order since it's not specified, what would I use for the following values?

Driver::ghost_size                      = 5

Coordinates::patch_boundary_size        = 5

Coordinates::additional_overlap_size    = 3

Coordinates::outer_boundary_size        = 5

Carpet::prolongation_order_space        = 5

Is there anything else I missed that I should change?

Thank you,

Rhiannon.