= SEC fractionation range
{c}
The <SEC fractionation range> has differential <SEC pore access>. Larger excluded species share $V_e\simeq V_0$; fully included species share $V_e\simeq V_t$. Neither group can be size-ranked by elution. A broader pore distribution can trade separation per size increment for range.<Size Exclusion Chromatography: Principles and Methods by GE Healthcare>[GE Healthcare, Size Exclusion Chromatography: Principles and Methods, printed pp. 17–18, Figures 1.9–1.10: selectivity curves, fractionation and exclusion limits]{ref}
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