Herschel SPIRE observations at 250, 300, and 500 μm (background) overlapped with external FUV flux estimated map in the Orion A cloud from van Terwisga & Hacar (2023). The cyan stars mark possible ionizing stars in their vicinity and crosses show the Class II disks. Active star-forming regions and the location of the M512 protostar are indicated. The yellow circles show the CO shells identified by Feddersen et al. (2018) in the yellow square field.