**Appendix A**

**Figure A1.** Exp. 1—KH2PO4 distributions (**a**) q0-distribution shadowgraphic probe; (**b**) q0-distribution QICPIC; (**c**) q3-distribution shadowgraphic probe; (**d**) q3-distribution QICPIC. *Solid lines*—percentiles of the shadowgraphic probe; *Dashed lines*—percentiles of the QICPIC; *yellow and red* −0.15 and 0.85 percentile distribution; *blue*—transient mean sizes of the distribution.

**Figure A2.** (**a**) Percentiles and mean values of the crystal size distributions for Exp. 1—KH2PO4 *thin lines*—percentiles of the q0-distribution; *bold lines*—percentiles of the q3-distributions; *Solid lines*—percentiles and mean values shadowgraphic probe; *Dashed* lines—percentiles and mean values QICPIC; *brown; magenta* −0.15 and 0.85 percentile of the corresponding distribution; *blue*—mean size of the corresponding distribution. (**b**) Comparison of the mass distribution: shadowgraphic probe, QICPIC, sieve analysis.

**Figure A3.** (**a**) Temperature profile of the Exp. 1—KH2PO4: saturation, seeding, linear cooling ramp, and final temperature. (**b**) Concentration profile of Exp. 3—KH2PO4: FTIR, offline samples and saturation curve.

**Figure A4.** (**a**) Quantity of single crystals analyzed (**b**) the optical and suspension densities during experiment Exp. 1—KH2PO4.

**Figure A5.** Concentration profile of (**a**) Exp. 1—KH2PO4 and (**b**) Exp. 2—KH2PO4; FTIR, offline samples and saturation Equation (1).

**Figure A6.** Exp. 2—KH2PO4 distributions (**a**) q0-distribution shadowgraphic probe; (**b**) q0-distribution QICPIC; (**c**) q3-distribution shadowgraphic probe; (**d**) q3-distribution QICPIC. *Solid lines*—percentiles of the shadowgraphic probe; *Dashed lines*—percentiles of the QICPIC; *yellow and red* −0.15 and 0.85 percentile distribution; *blue*—transient mean sizes of the distribution.

**Figure A7.** (**a**) Percentiles and mean values of the crystal size distributions for Exp. 2—KH2PO4 *thin lines*—percentiles of the q0-distribution; *bold lines*—percentiles of the q3-distributions; *Solid lines*—percentiles and mean values shadowgraphic probe; *Dashed* lines—percentiles and mean values QICPIC; *brown; magenta* −0.15 and 0.85 percentile of the corresponding distribution; *blue*—mean size of the corresponding distribution. (**b**) Comparison of the mass distribution: shadowgraphic probe, QICPIC, sieve analysis.

**Figure A8.** (**a**) Temperature profile of the Exp. 2—KH2PO4: saturation, seeding, linear cooling ramp and final temperature. (**b**) Concentration profile of Exp. 3—KH2PO4: FTIR, offline samples and saturation curve.

**Figure A9.** Quantity of single crystals analyzed during experiment Exp. 2—KH2PO4.

#### **References**


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