Count map of the Crab pulsar region, composed of 5 × 5 images (corresponding to |${2{^{\prime \prime }_{.}}4} \times {2{^{\prime \prime}_{.}}4}$|⁠). The dark counts are subtracted and the flat correction is applied. The position of the Crab pulsar is indicated by a circle. Note that the target position slightly shifted to the left during the whole observations due to the imperfect tracking accuracy. (Color online)