Table 13.

Calculation of the WS3-SRM and WS4-SRM d₂₂₀ values.

NW04 d220 t = 22.5 °C, p = 0 Pa	192.015 569 6(10) × 10−12 m
	WS3-SRM	WS4-SRM	WS3-SRM & WS4-SRM
(dSRM − dNW04)/dNW04	14(13) × 10−9	2(17) × 10−9	8(16) × 10−9
(dSRM − dNW04)/dNW04 (expanded uncertainty)	14(26) × 10−9	2(35) × 10−9	8(33) × 10−9
640d, 640e, and 640f d220 t = 22.5 °C, p = 0 Pa	192.015 572 3(51) × 10−12 m	192.015 569 9(68) × 10−12 m	192.015 571 2(64) × 10−12 m