Planck 2015 results
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Table 10

Prior for moveable knot positions.

Parameter range Prior type

10-4 Mpc-1 = k1<k2<...<kNknots = 0.3 Mpc-1 log uniform (sorted)
log uniform
2 ≤ Nknots ≤ 10 integer uniform

Notes. The positions are distributed in a log-uniform manner across a wide range. The k positions are also log-uniformly distributed across the entire range needed by CosmoMC and are sorted so that k1<...<kNknots. When we marginalize over the number of knots, Nknots, we assume a uniform prior between 2 and 10.

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