the empirical formulae for calculating Range		Substances
$y = A_{1} e^{x / t_{1}} + y_{\circ}$
PSTAR	This work
A₁ = 6.50318 × 10⁻¹⁵ t₁ = 0.02013, yₒ = −0.05453 R² = 0.99988	A₁ = 2.33355 × 10⁻¹⁴ t₁ = 0.02082, yₒ = −0.03587 R² = 0.9999	Water
A₁ = 5.65636 × 10⁻¹⁵ t₁ = 0.01985, yₒ = −0.06137 R² = 0.99992	A₁ = 2.04888 × 10⁻¹⁴ t₁ = 0.02053, yₒ = −0.03963 R² = 0.99996	Muscle, Skeletal
A₁ = 5.09688 × 10⁻¹⁵ t₁ = 0.01844, yₒ = −0.04659 R² = 0.99988	A₁ = 2.054547 × 10⁻¹⁴ t₁ = 0.01924, yₒ = −0.03062 R² = 99986	Bone, Cortical