Planck 2015 results
Free Access

Fig. 23


Linear spline reconstruction. The primordial power spectrum is reconstructed using Nknots interpolation points : i = 1,2,...,Nknots }. The end knots are fixed in k but allowed to vary in , whereas the internal knots can vary subject to the constraint that k1<k2< ··· <kNknots. The function is constructed within the range [ k1,kNknots ] by interpolating logarithmically between adjacent knots (i.e., linearly in log -log  space). Outside this range the function is extrapolated logarithmically. The function thus has 2Nknots−2 parameters.

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