Question: Accessing specificequations using BSplines


Splines and BSplines etc for curve fitting.

The attached short program uses with(CurveFitting) and BS:=BSpline(2,x);  outputs four expressions, the third being 

2-x, x<2.  I'd like to be able to access this, and plot it. but plots[display](BS[3], x=1..2); comes up with an error message.

Thanks in advance for any help. 

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