nd we have f (s) s log (20s/recentMaxSTI) 2 -F constant, (so sech2 (f (s)) • shape ( 1 1 \ 2 2s) which has magnitude less than 1 whenever Ishapei < I 2; l• Choosing the shape parameter to satisfy 0 < shape < min (2, I 2* I) then guarantees that I(91 0 f )'I < 1. Finally, g o f maps the cl