source
The data were collected at several recording stations at
$\mbox{Paran\'{a}}$ State, Brasil, belonging to the following companies:
COPEL, IAPAR, DNAEE, SUREHMA and INEMET.
The data base was organized by Laura Regina Bernardes Kiihl (IAPAR,
Instituto $\mbox{Agron\^{o}mico}$ do $\mbox{Paran\'{a}}$, Londrina, Brasil)
and the fraction of the data included in this data-set was
provided by Jacinta Loudovico Zamboti (Universidade Estadual de
Londrina, Brasil).
The coordinates of the borders of $\mbox{Paran\'{a}}$ State were provided
by $\mbox{Jo\~{a}o}$ Henrique Caviglione (IAPAR).