@noindent
is on the stack and we wish to do a simple linear fit. Type
@kbd{a F}, then @kbd{1} for the model, then @key{RET} to use
-the default names. The result will be the formula @expr{3 + 2 x}
+the default names. The result will be the formula @expr{3. + 2. x}
on the stack. Calc has created the model expression @kbd{a + b x},
then found the optimal values of @expr{a} and @expr{b} to fit the
data. (In this case, it was able to find an exact fit.) Calc then