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An easy algorithm is given for interpolation whenever data comes from a strictly convex planar curve. The method makes use of a pair of tridiagonal methods of linear equations to find an approximate interpolant. Then approximation can be used with standard computer software to make an exact interpolant. •The information should always be planar and strictly convex.•The technique is sturdy and fast. Crown Copyright © 2020 Published by Elsevier B.V.Introduction Short-term intercontinental health