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Planck 2015 results
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Table 13

For each of the four foreground cleaned maps, we compute fNL for the local, equilateral, and orthogonal modes using two different polarization masks, one with fsky = 0.74 and the other with fsky = 0.64, while for temperature we use a single mask with fsky = 0.76.

fsky = 0.74 fsky = 0.64 Difference
Local Equilateral Orthogonal Local Equilateral Orthogonal Local Equilateral Orthogonal
SMICA
T .............. 6.8 ± 5.4 −17 ± 66 −48 ± 33 ... ... ... ... ... ...
E .............. 25 ± 30 147 ± 159 −137 ± 73 48 ± 31 220 ± 168 −180 ± 81 −23 ± 16 −73 ± 68 43 ± 34
T+E .............. 4.0 ± 4.8 5 ± 46 −30 ± 21 4.6 ± 5.2 19 ± 55 −37 ± 22 −0.7 ± 1.2 −14 ± 14 6.7 ± 7.7
SEVEM
T .............. 8.1 ± 5.8 −11 ± 75 −49 ± 34 ... ... ... ... ... ...
E .............. 44 ± 38 302 ± 183 −172 ± 91 43 ± 39 303 ± 191 −170 ± 96 1 ± 19 0 ± 76 −2 ± 49
T+E .............. 6.4 ± 5.0 15 ± 52 −44 ± 23 6.2 ± 5.3 31 ± 54 −50 ± 25 0.2 ± 1.3 −16 ± 15 6.3 ± 8.8
NILC
T .............. 6.4 ± 5.8 −31 ± 76 −50 ± 33 ... ... ... ... ... ...
E .............. −1 ± 30 64 ± 162 −78 ± 77 22 ± 30 190 ± 162 −84 ± 77 −23 ± 16 −124 ± 67 6 ± 37
T+E .............. 3.3 ± 4.9 −15 ± 50 −27 ± 23 4.0 ± 5.3 1 ± 56 −33 ± 23 −0.7 ± 1.3 −16 ± 13 5.4 ± 7.5
Commander
T .............. 6.4 ± 6.6 −3 ± 77 −49 ± 36 ... ... ... ... ... ...
E .............. 28 ± 37 278 ± 178 −56 ± 81 61 ± 38 337 ± 188 −122 ± 91 −32 ± 20 −60 ± 92 66 ± 47
T+E .............. 5.2 ± 5.4 30 ± 50 −39 ± 23 6.0 ± 5.7 45 ± 55 −51 ± 25 −0.7 ± 1.5 −15 ± 14 11.5 ± 8.9

Notes. We then calculate the difference between the two measurements and compare with expectations from simulations, obtained in the following way: firstly, we generate realistic Gaussian realizations for each component separation pipeline, not including foregrounds; then, for each simulated map and NG model, we measure fNL using the two masks in turn; finally, we calculate the standard deviation on 100 realizations. See the main text for more details and a discussion of these results, which were obtained using the low resolution modal pipeline.

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