Comparison between vertical displacements U(θ, t) independently computed by Vk, Gs and Zm for Test 1/2 (cap load model). Numbers in parentheses following the contributor abbreviation is time in units of kyr. Units for U, V and N are metres throughout. The figures are obtained by truncating the outputs of codes at the centimetre level. Superscripts a and b indicate that the corresponding quantities are computed by Vk at θ= 0.01° and θ= 179.99°, respectively. Symbol ‘∞’ stands for t= 10³ kyr for Gs. The corresponding values are not available for Vk and Zm, since the computations would require an exceedingly long CPU time.