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We analyse the mask associated with the$2n$   -point interpolatory Dubuc–Deslauriers subdivision scheme$S_{a^{[n]}}$   . Sharp bounds are presented for the magnitude of the coefficients$a^{[n]}_{2i-1}$    of the mask. For scales$i \in [1,\sqrt{n}]$    it is shown that$|a^{[n]}_{2i-1}|$    is comparable to$i^{-1}$   , and for larger power scales, exponentially decaying bounds are obtained. Using our bounds, we may precisely analyse the summability of the mask as a function of$n$    by identifying which coefficients of the mask contribute to the essential behaviour in$n$   , recovering and refining the recent result of Deng–Hormann–Zhang that the operator norm of$S_{a^{[n]}}$    on$\ell ^\infty $    grows logarithmically in$n$   .

A note on magnitude bounds for the mask coefficients of the interpolatory Dubuc–Deslauriers subdivision scheme