Top: The pressure corrected daily mean count rate in Syowa MD vertical channel (SYO_MD_V) (open black triangle) and the variation reproduced from α_MSS and ΔT_MSS (blue circle) (see text). Open red triangles indicate the CR variation reproduced by the MC simulation of particle transport in the atmosphere (see text). Bottom: The observed variation corrected for the atmospheric temperature effect. Minor tick marks on the horizontal axis are indicated every 27 days.