[Retracted] A Study on Nonvisual Effects of Natural Light Environment in a Maternity Ward of a Hospital in Cold Area

Figure 9

Whole-year Stim.freq distribution at each measuring point in the wards facing different directions: (a) facing east (i) measuring point a, (ii) measuring point b, (iii) measuring point c, and (iv) measuring point d; (b) facing south; (c) facing west; and (d) facing north.

(a)

(b)

(c)

(d)