Availability of 1-min Data for 1987 
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1987    JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 
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AMD     *** **- --*         **# *** *** *** **- **#
CPS                                     ***
DIK         -** #*- -*- -** ***     -*- **#     -*# --*
MIR                                                 ###
MOS     #**     -*- **- *#* **-     --# #*# **-
SAL                             -** **# #** #--     --*
SBT                             --* *--
TIK     ### *## #*# #** ##* #*# #*- **# *#* ### *--
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  "-" - No data;    "*" - gaps;    "#" - complete;