-v BTC in EUR
-t BTC sell
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DEF:a=/var/www/localhost/rrd/crypto-BTC.rrd:sell:AVERAGE
COMMENT:        max.          avg.         min.          cur.\n
CDEF:idle=a,0.00,EQ,INF,0,IF
CDEF:smooth=a,7200,TREND
CDEF:predict=86400,-7,3600,a,PREDICT
CDEF:sigma=86400,-7,3600,a,PREDICTSIGMA
VDEF:avg=a,AVERAGE
AREA:a#CC9A5760:sell\n
LINE2:avg#00FF00:Avg\n:dashes=5
LINE2:predict#FF00FF:Trend Prediction\n:dashes=5
LINE1:smooth#FF0000:Sliding Window Smoothing