Colour–colour diagram of the IPHAS detections (not sources) in the 1.3 arcmin field around ASCA coordinates of AX J194939+2631. Objects with Hα excess are located towards the top of the diagram. The r′ magnitude is colour-coded. Black solid line indicates unreddened main sequence, while green dashed lines are those of constant HαEW with corresponding values labelled on the left (from Drew et al. 2005). Three detections of IPHAS J194938.39+263149.2 marked with larger circles correspond to the only prominent Hα emitter in the field. Error bars given for it are applicable to other detections as well.