In the section of the docs about spline identifiers (6.1.9), what is the
significance of the reference numbers (i.e., the float values that are in
increments of 0.25) in the example below:
#declare MySpline =
  spline {
    cubic_spline
    -.25, <0,0,-1>
    0.00, <1,0,0>
    0.25, <0,0,1>
    0.50, <-1,0,0>
    0.75, <0,0,-1>
    1.00, <1,0,0>
    1.25, <0,0,1>
  }

then in the section 6.1.9.1, they give this example:
#declare myspline = spline {
      1, <4,5>
      3, <5,5>
      5, <6,5>
  }

  Foo(myspline, 2)

I guess what I'm asking is, what is the significance of the reference
numbers (if that's what they are) being 0.25 apart, vs. being odd numbers?
It further confuses me that in the Foo macro, a `2' is thrown in as a
parameter, which I don't see in the spline identifier declaration....
What's up with this?
TIA,
LibraryMan

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