Ice751: Stack 4 layers of granulated ice I
  Layer 1 (top): std ice seed (0.18 - 0.25 mm) [1.8 g; 7 mm starting thickness]
  Layer 2: 1 x P-drop ice from Ice747 [4.4 g; 13 mm starting thickness]
  Layer 3: 3 x P-drop ice from Ice703 [8.8 g; 30 mm starting thickness]
  Layer 4 (bot): nebulized ice 97.8 g; 33 mm starting thickness]
T= 192 K, briefly 150 MPa, then 80-120 MPa ~21 hrs hydrostatic compaction

<Ice751 home>
<Reference microstructures>
1 x P drop ice (layer 2) 3 x P drop ice (layer 3 Nebulized ice (layer 4)