The formation in the second panel is a reference to Rei being the tallest of all 35 girls, and those behind her among the shortests. From left to right:
Rei: 172 cm
Rimi: 150 cm
Tsukushi: 150 cm
Ako: 148 cm
Chiyu: 140 cm (shortest of all)
Tae herself is also quite tall with 164 cm.