Question: (f)solving a spline function

Dear primers,

i read in a list of data (which are called roi), then i would like to fit these data (done in this case by a spline function) and compute the values for y=0.3.
for some reason, maple (i am using maple14) gives me only one value instead of two.

i would be happy if somebody could give me a hint how i get both values.

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