Table 2. Summary of map resolution estimates.

Metric	Objects used	Purpose	Values	Meaning, possible actions
d FSC	Half-maps	Highest resolution at which the experimental data are confident	The higher the better	Resolution determined using half-maps method
d 99	Map	Resolution cutoff beyond which Fourier coefficients are negligibly small	d 99 ≥ d FSC	Expected values
			d 99 < d FSC	Verify d FSC; omit coefficients with d 99 ≤ d < d FSC
			d 99 >> d FSC	Sharpen the map
d model	Map and model	Resolution cutoff at which the model map is the most similar to the target map	d model ≥ d FSC	Expected values
			d model < d FSC	Verify d FSC; check ADP (too large?); validate map details
			d model >> d FSC	Sharpen the map
			d model << d 99	Check ADP (too large?)
			d model >> d 99	Check ADP (too small?); check the model
d FSC_model	Map and model	Resolution cutoff up to which the model and map Fourier coefficients are similar	d FSC_model ≥ d FSC	Expected values
			d FSC_model < d FSC	Verify d FSC; omit coefficients with d FSC_model ≤ d < d FSC
			d FSC_model ≥ d FSC	Sharpen the map
			d FSC_model >> d model	Omit coefficients with d model ≤ d < d FSC_model
			d FSC_model << d model	Sharpen the map