Figure 1
From: Effect of supersaturation on hillock of directional Growth of KDP crystals

General view of the seed, (a) and a crystal grown from seed in defined direction of 59° with respect to Z axis, (b), the schematic diagram of KDP single crystals grown with seeds of 59° to Z axis (the left) and Z-cut seeds (the right), (c).
(The black arrow represents the vertical direction of crystallizer).