Spanners,
You are mistaken !
EGPWS doesn't use WXR. The info is fed from the EGPWS computer to the EHSI (B757) using the WXR data buses.
You either select WXR or EGPWS.
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So that you may not be the martyred slaves of Time,
get drunk, get drunk,
and never pause for rest!
With wine, poetry, or virtue,
as you choose!"