Sorry, I was hasty and in error.
The following ought to be correct,
with a short scene file appended to demonstrate how it works.

> #declare Vector = <1, 2, 3>;
>
> individual components can be addressed as:
>
> Vector.x, Vector.y, and Vector.z
> but also as
> Vector.u, Vector.v, and Vector.z
>
> the 4th "TERM" in a 4-term vector is filter, since POV-Ray interprets this as a
> color expression.
> so it's addressed as
> Vector.filter (not Vector.f) or Vector.t
> and a 5th term is transmit
> so it's addressed as
> Vector.transmit (not Vector.t - that would be Term 4)
>
>
> Search terms (for future reference)
> .x .y .z .t .u .v .filter .transmit
> 4-component vector
> 5-component vector
> 4-term vector
> 5-term vector
> 4-term color expression
> 5-term color expression

########################################################################

#version 3.7;
global_settings {assumed_gamma 1.0}
#include "debug.inc"
  Set_Debug (true)

#declare Vector = <1, 2, 3, 4, 5>;

#debug concat( "Vector.x =        ", str(Vector.x, 3, 0), "\n")
#debug concat( "Vector.u =        ", str(Vector.u, 3, 0), "\n\n")
#debug concat( "Vector.y =        ", str(Vector.y, 3, 0), "\n")
#debug concat( "Vector.v =        ", str(Vector.v, 3, 0), "\n\n")
#debug concat( "Vector.z =        ", str(Vector.z, 3, 0), "\n\n")
#debug concat( "Vector.t =        ", str(Vector.t, 3, 0), "\n")
#debug concat( "Vector.filter =   ", str(Vector.filter, 3, 0), "\n\n")
#debug concat( "Vector.transmit = ", str(Vector.transmit, 3, 0), "\n\n")

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