1989_load_uncertainty — source 1989 page 1241 table IX
review transcription from v0.2; independent validation pending


std_dev_multiple	peak_load_MW	probability
-3	162.8	0.006
-2	170.2	0.061
-1	177.6	0.242
0	185	0.382
1	192.4	0.242
2	199.8	0.061
3	207.2	0.006
