(1) Data are not free from instrumental effect, 
and anybody who use this archieve must contact 
yama@irf (M. Yamauchi at IRF-Kiruna).

(2) Making one spectrogram normally takes a day 
because of noise etc., and anybody who use any
data in this directory and subdirectory for 
public presentation/publicatioon must contact 
somebody at IRF-Kiruna for co-authorship.
We require either one co-author or acknowledgement
depending on how essential the data is.