... Tetrahedron: Asymmetry. Volume 18, Issue 2, 14 February 2007, Pages 260–264. ... The maximum and minimum residual electron density in the final difference map was 0.15 and −0.15 e/Å 3 . The applied weighting scheme was w = 1 / [ σ 2 ( F o 2 ) + ( 0.0179 P ) 2 + 0.4161 P ...