Comparison of Zr data in grains to CCSNe models. (a) and (b) Zirconium isotopic ratios vs. atomic masses measured in anomalous subgrains in grains KFC1h-614 and KFC1h-721 and best-fit mixing lines obtained from the RIT15 model. (c) Molybdenum isotopic ratios vs. atomic masses of Mo isotopes measured in anomalous subgrains in grains KFC1h-614 and KFC1h-721. The best result from our two-layer mixing calculations is shown by the purple dashed line. Grey dashed line indicates the solar isotopic values. All errors bars show 1σ variation.