50 



uS 35 



25 



20 L_ 



150 



203 OBSERVATIONS 



145 140 135 130 125 120 

 LONGITUDE, DEGREES W 



115 110 



^ 



i Un L 



203 OBSERVATIONS 



APRIL OCT APRIL 



JULY JAN JULY 



190 OBSERVATIONS 



~-r 



rA^ 



176 OBSERVATIONS 



n 



APRIL OCT APRIL 



JULY JAN JULY 



239 OBSERVATIONS 



Figure 7. Location of dato used {or large-area regression model. 



44 



