FIGURE 3. The 3-yr periodic mode for each of the 72 provinces of Thailand.
From the following article:
Travelling waves in the occurrence of dengue haemorrhagic fever in Thailand
Derek A.T. Cummings, Rafael A. Irizarry, Norden E. Huang, Timothy P. Endy, Ananda Nisalak, Kumnuan Ungchusak & Donald S. Burke
Nature 427, 344-347(22 January 2004)
doi:10.1038/nature02225

Data are presented for provinces from the most southerly to the most northerly from bottom to top.
