However, the form of the residual for the 1:3 sample deviates from the other two samples, with a R 2 value of 0.932 and a negative peak at r = 1.6 Å , which corresponds to the Si-O bond length in the borosilicate glass which was used as the sample container. This suggests that the sample container had been over-subtracted during data correction and normalisation. Further support for this is seen in the position of the proposed interface peak which occurs in the residual at 3.33 Å (i.e., slightly shifted from the position of this peak from the other samples). This shift could be caused by an additional negative peak at 3.1 Å corresponding to the Si-Si distance in borosilicate glass removing intensity from the low-r side of the positive peak (Figure ). As such, the total scattering data from this sample were recorrected using the empty capillary (container) scattering reduced by 7.5% to account for this issue. This new adjusted PDF shows minor deviation from the unaltered/unadjusted 1:3 blend (Figure ). By subsequently performing MLR on this adjusted sample, the features in the residual associated with missubtraction of the capillary scattering were suppressed (Figure ).