W44. Data points are radio from Frail et al. (1996) and Giacani et al. (1997), X-ray from Petre et al. (2002) and Harrus et al. (2006), upper limits on gamma ray from Aharonian et al. (2002) and Abdo et al. (2009). The solid line is the total luminosity, dashed line is the IC-CMB, dash–dotted line is the IC on the local IR background (same as for Crab nebula) and dotted line is IC–SYN.