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S3·c

SAE on the reconstruction residuals

Encode r = h − ĥ over the 1000-vector substrate: which features does the text channel systematically drop? Answer: the SAE can't be asked — read the sanity gate.

substrate
1000 gold + exp-011 AR reconstructions
sae
gemma-scope-2 L40 16k l0=60
control
norm-matched Gaussian noise
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