Left: Test statistics map in the region around M16 derived from Fermi-LAT observations. The position of the O stars in the cluster NGC 6611 is indicated as blue stars, and its termination and forward shock radii are indicated a solid and dotted blue circles. The dashed circle indicates the limit of the H II region. The light blue, cyan, and pink contours indicate CO gas column densities of 1.5 × 10²², 1.7 × 10²², and 2.3 × 10²² cm⁻², which were obtained in the velocity range 15–30 km s⁻¹. The magenta circles indicate the position of Fermi sources from the 4FGL catalog Ballet (2023) and their relative position uncertainties, evaluated as their 68% confidence radius. Center: Molecular gas distribution in the region as traced by CO line emission, integrated over the line of sight in the velocity range 15 km/s, 30 km/s. The black contours refer to Fermi-LAT test statistics and represent 3, 4, and 5σ levels. Right: Velocity-longitude distribution of CO. The map is integrated over the whole latitude range. The dot indicates the position of NGC 6611.