Table 1. Symbols Used in Figure 1.

Ordinates Osmolalities (Os)	Abscissae Volumes (V, V)	Ordinates Times Abscissae Solute (mOsm)
Os1 = baseline	Ve1 = baseline EC	Os1 x Ve1 = baseline EC
Os2 = final	Vi1 = baseline IC	Os1 x Vi1= baseline IC
Os3 = infusate	V1 = Ve1 + Vi1 = baseline body water	Os3 x V3 = infused
Os4 = Hypothetical EC osmolality after equilibration of osmolality in the EC but before any interactions between EC and IC	V3 = infusate (added) \V = final EC gain	Os4 x (Ve1 + V3) = final EC
	V +Ve1 = final EC	Os2 x (Ve1 + V) = final EC, Note: Os4 x (Ve1 + V3) = Os2x(Ve1 + V)
	V – V3 = osmotic volume transfer from IC to EC	[Os]2 x (Vi1 – [V – V3]) = final IC, Note: [Os]2 x (Vi1 – [V – V3]) = Os1xVi1
	Vi1 – (V – V3) = final IC