Dust environment of comet 67P. Panel a): maximum mass escaping the 67P inner coma (of size of about 20 nucleus radii) for compact (solid line) and fluffy (dotted line) grains. Panel b): pre-perihelion (solid line) and post-perihelion (dashed line) dust mass-loss rate provided by the interpolated values of Afρ (see Fig. 1), the dust velocity (panel c)), the differential size distribution (panel d)), and the assumed value of the geometric albedo A_p = 0.04: the mass-loss rate values are inversely proportional to A_p. Panel c): dust ejection velocity from the inner coma for compact (solid line) and fluffy (dotted line) grains; its intersection with the assumed escape velocity (dot-dashed line) provides the sun distance where 1 mg grains are able to escape the inner coma (panel a)). Panel d): pre-perihelion (solid line) and post-perihelion (dashed line) power index of the differential dust size distribution for grains of β > 5 × 10^-4; two-dot-dashed line: power index of the dust distribution for grains of β < 5  ×  10^-4.