Ice762 (NG68): double sample, std ice seed vs coarse ice seed
  Top piece: standard ice I seed (0.18-0.25-mm)
  Bottom piece: coarse ice I seed (0.50-1.00 mm )

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<Reference microstructures>
Top (standard ice seed), S1 Site 01 Top (standard ice seed), S2 Site 01≈Site 02