Density and dust temperature models for H-MM1 and Oph D. Top: H-MM1 The isodensity surfaces (left) are 10⁴ cm⁻³ (green), 10⁵ cm⁻³ (purple), 5 × 10⁵ cm⁻³ (red), and 10⁶ cm⁻³ (blue). The isotemperature T_dust surfaces (right) are 14 K (green), 12 K, (purple), 11 K (red), and 10 K (blue). Bottom: OphD The isodensity surfaces (left) are 10⁴ cm⁻³ (green), 10⁵ cm⁻³ (purple), 2 × 10⁵ cm⁻³ (red), and 4 × 10⁵ cm⁻³ (blue). The isotemperature T_dust surfaces (right) are 11 K (green), 10 K (purple), 9 K (red), and 8 K (blue). The positive X-axis points to the observer, and the Y-axis points to the equatorial west. The scale is in arcseconds. In both cores, the gas kinetic temperature, T_kin, is assumed to be equal to T_dust in the inner parts, and settle to 11 K in the outer parts.