Table 2. Definitions and functions used in the propensity functions in Table 3.

Definitions
The Kronecker delta	${\delta }_{x,y}=\left\{\begin{array}{c}1,x=y\\ 0,x\ne y\end{array}\right\}$
Neighbour effect	${\displaystyle E_i=\sum _{j\in M_i}\left({\rho }_{me2}{\delta }_{S_j,me2}+{\delta }_{S_j,me3}\right)}$
Neighbouring set	${\displaystyle M_i=\left\{\begin{array}{c}\left\{i-3,i-2,i-1,i+1,i+2\right\},ieven,\\ \left\{i-2,i-1,i+1,i+2,i+3\right\},iodd\end{array}\right\}}$
Fraction of histones in me3 or me2	${\displaystyle P{\left(R_m\right)}_{\text{me2/me3}}=\frac{1}{N_m}\sum _{j\in R_m}\left({\delta }_{S_j,me2}+{\delta }_{S_j,me3}\right)}$
Sum of bound proteins	$Q=\sum _{j=1}^{N_p}{\delta }_{P_j,\mathrm{b}\mathrm{o}\mathrm{u}\mathrm{n}\mathrm{d}}$
Protein feedback	${\displaystyle G=\left\{\begin{array}{c}1,Q\ge v,\\ 0,Q<v\end{array}\right\}}$
Spontaneous protein binding	${\displaystyle \begin{array}{l}{\gamma }_{bind}\left(w\right)=\frac{{\gamma }_{\mathrm{V}\mathrm{I}\mathrm{N}3}\cdot w}{\left(1+\frac{w}{w_0}\right)}\\ {\text{w}}_{\text{0}}\mathrm{i}\mathrm{s}\mathrm{t}\mathrm{i}\mathrm{m}\mathrm{e}\mathrm{s}\mathrm{c}\mathrm{a}\mathrm{l}\mathrm{e}\mathrm{f}\mathrm{o}\mathrm{r}\mathrm{V}\mathrm{I}\mathrm{N}3\mathrm{b}\mathrm{i}\mathrm{n}\mathrm{d}\mathrm{i}\mathrm{n}\mathrm{g}\mathrm{s}\mathrm{a}\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}(\mathrm{w}\mathrm{e}\mathrm{e}\mathrm{k}\mathrm{s})\\ w\mathrm{i}\mathrm{s}\mathrm{w}\mathrm{e}\mathrm{e}\mathrm{k}\mathrm{s}\mathrm{i}\mathrm{n}\mathrm{c}\mathrm{o}\mathrm{l}\mathrm{d}\end{array}}$