Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-019-0293-z, published online 23 September 2019.

In the version of this article initially published, Fig. 4 included some errors. In Fig. 4c, the color for the left bar in each set of three bars (green) was incorrect; the correct color is orange (H2AK119ub, as in key). In Fig. 4d, top row, the downward error bars for H3K27me3 in the top middle plot (Fgf11 B) were incorrect; the correct s.d. in the negative direction is smaller for each. In Fig. 4d, bottom row, the far left downward error bar for HA-dCas9 in the left plot (Fgf11 A) was incorrect; the correct s.d. in the negative direction is larger. The errors have been corrected in the HTML and PDF versions of the article.

Fig. 4
figure 4figure 4

Original and Corrected