Multi-spatial scale and multi-wavelength view of the SNR W44 and the nearby cloud G034.77. Left: three-color image of G034.77 together with the SNR W44 and the HII region G034.758-00.681. Red is 8 µm, green is 5.8 µm, and blue is 4.5 µm emission from the Spitzer GLIMPSE survey (Churchwell et al. 2009). Right top: Hershel 70 µm images of G034.77; the positions for which the D/H ratios were obtained in this work are overlaid as orange circles. The aperture size is 34″, i.e. the largest aperture in our data. Right Bottom: mass surface density map (colour scale) of G034.77 (Kainulainen & Tan 2013). In both panels, the Σ=0.09 g cm⁻² contour, equivalent to a visual extinction A_V= 20 mag is shown in magenta.