domain
Minimum and maximum values of the spline domain.
Discussion
For a terminated spline basis, the domain is the interval covered by the repeated end knots:
\[\mathrm{domain} = [\tau_1,\ \tau_{N_k}].\]Outside this interval the terminated basis is zero, so this property is the natural plotting and evaluation range for the spline.
spline.domain
% returns [tMin tMax]