Orthogonal Axis Compensation procedure, new source?

[sungod3k]

Im fine tuning my machine and i was curious about the Orthogonal Axis Compensation.

The wiki however tries to link a dead link. Is there any other source for such a procedure?
https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Epilogue

"A calibration procedure for orthogonal axis compensation can be found at https://reprappro.com/documentation/comm..."

[dc42]

A quick web search turned up http://reprapltd.com/reprappro/documentation/commissioning-introduction/calibration-duet/index.html#Orthogonal_Axis_Compensation.