Table 4. Degrees of colocalization as fuzzy linguistic variables and the respective ranges of values of popular coefficients used to estimate colocalization, such as PPI, Rr, R, k₁(k₂), and m₁(m₂). Set includes just five different variables: “Very Weak”, “Weak”, “Moderate”, “Strong”, and “Very Strong”, which can be used by cell and molecular biologists as a community-wide standard for describing the results of quantitative colocalization studies. PPI was calculated using PPA software. Other coefficients were calculated using CoLocalizer Pro software (see Methods). See Fig. 1 for description of a Gaussian membership function and Tables 1,2,3 for details about steps leading to creation of this Table.

Degree of colocalization/fuzzy linguistic variable Value of coefficients	Very Weak	Weak	Moderate	Strong	Very Strong
PPI	0 ~ 0.12	0.13 ~ 0.39	0.40 ~ 0.60	0.61 ~ 0.87	0.88 ~ 1.0
Rr	−1.0 ~ −0.27	−0.26 ~ 0.09	0.1 ~ 0.48	0.49 ~ 0.84	0.85 ~ 1.0
R	0 ~ 0.49	0.50 ~ 0.70	0.71 ~ 0.88	0.89 ~ 0.97	0.98 ~ 1.0
k1(k2)	0 ~ 0.49	0.50 ~ 0.70	0.71 ~ 0.88	0.89 ~ 0.97	0.98 ~ 1.0
m1(m2)	0 ~ 0.54	0.55 ~ 0.77	0.78 ~ 0.94	0.96 ~ 0.98	0.99 ~ 1.0