(a) ARF
(b) IDW
(c) SRT
(d) ARF
(e) IDW
(f) SRT
(g) ARF
(h) IDW
(i) SRT
(j) ARF
(k) IDW
(l) SRT
Figure 9: Comparisons of two types of errors for CD at 02:00 (a)–(c), 08:00 (d)–(f), 14:00 (g)–(i), and 20:00 (j)–(l).