Typically, the upper part is understood as sitting 夂 cross-legged. In some cases, however, it is also understood as a twisted foot, as here in winter 冬 when you twist your foot on the ice 冫.
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Vocabulary
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图表
tú biǎo
chart; diagram
幡然改图
fān rán gǎi tú
to change a plan as quickly as a flag (changes in the wind)(idiom)
限制酶图谱
xiàn zhì méi tú pǔ
restriction mapping (in genomics); restriction pattern
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