In X-ray crystallography, single-state models use B-factors (which include various data quality effects) to describe the uncertainty of atomic positions. In a similar way, a single-state conformer collections generated from NMR data can be represented by a single representative conformer, along with information about coordinate uncertainty (Figure ). The wwPDB uses the medoid conformer as the representative structure, defined as the single conformer in the collection most like all the other conformers . Tools like Dihedral Angle Order Parameter (DAOP) , FindCore , and CYRANGE assess well-defined and not-well-defined residue ranges across the NMR conformer collection. The cutoffs used by these tools are based on standardized conventions. Presently, the wwPDB has adopted CYRANGE conventions to annotate well-defined residue ranges in the NMR structure validation report. PDBStat also uses these tools and writes information about well-ordered residues as well as atom-specific coordinate variances into a mmCIF (or conventional PDB format) coordinate file, allowing graphical rendering of this information onto a single representative conformer (e.g., the medoid conformer) (Figure ). After aligning the models with respect to a core atom set, coordinate uncertainties are converted using the Debye-Waller equation to effective "NMR B-factors" , indicating the variability and uncertainty in atomic positions across the conformer collection. It is unfortunate that these annotations are not more widely used compared to the widespread adoption of the analogous concept of predicted LDDT (pLDDT) scores reported for AlphaFold2 models . These annotations are essential for the informed use of NMR structures.