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Table 2:

Relative mass contribution of amorphous-small ( $m_{\rm a;s}$: $0.1~{\rm \mu m}$ and $0.3~{\rm\mu
m}$), amorphous-large ( $m_{\rm a;l}$: $0.5~{\rm \mu m}$, $0.8~{\rm \mu m}$, and $1.5~{\rm \mu m}$) and crystallized ($m_{\rm c}$: all particle radii) water ice grains derived from our modeling approach by using a rotational center at $3.8~{\rm\mu m}$.

Exposure
PA [$^\circ$] $N_{\rm A}$ [1022 m-2] $A_{\rm V}$ [mag] $m_{\rm a;s}$ [%] $m_{\rm a;l}$ [%] $m_{\rm c}$ [%] $\chi$
YLW 16 A (p - I) 178 1.7 19 97 - 3 0.0074
YLW 16 A (p - II) 178 2.5 27 >99 <1 <1 0.020
YLW 16 A (o) 88 2.2 24 70 1.7 28 0.078


YLW 16 A (o) - 1 88 2.0 22 32 1.1 67 0.011
YLW 16 A (o) - 2 88 1.9 20 31 1.4 68 0.0046
YLW 16 A (o) - 3 88 1.7 19 93 1.0 5.7 0.0042
YLW 16 A (o) - 4 88 1.8 20 78 10 12 0.010
YLW 16 A (o) - 5 88 1.7 19 87 4.9 7.8 0.0079
YLW 16 A (o) - 6 88 2.0 22 84 7.6 8.2 0.0042
YLW 16 A (o) - 7 88 2.0 22 4.5 3.2 92 0.0087

Notes. The position angles (PA) of the spectroscopic slit, measured from North to East, are additionally listed. The regions 1 to 7 represent spectra that originate in source regions with widths of $40~{\rm AU}$, $30~{\rm AU}$, $20~{\rm AU}$, $20~{\rm AU}$, $20~{\rm AU}$, $30~{\rm AU}$, and $40~{\rm AU}$. The spectra 3-5 originate closer to the photocenter than the spectra 1, 2, 6, and 7. In contrast, for the first three exposures listed, the counting rates within $4 \times FWHM$ of the spatial dimension are summarized. The quantities $N_{\rm A}$ and $A_{\rm V}$ represent the column density of water ice particles and the visual extinction derived along the line of sight (Eqs. (4), and (5)).


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