-v BTC in EUR
-t BTC sell
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DEF:sell=/var/www/localhost/rrd/crypto-BTC.rrd:sell:AVERAGE
LINE:6396.68#FF0000:2020-04-21
COMMENT:\n
LINE:7377.44#FF0000:2020-04-28
COMMENT:\n
AREA:sell#CC9A5760:sell
COMMENT:\n
COMMENT:        max.          avg.         min.          cur.\n
GPRINT:sell:MAX:%6.4lf %sEUR
GPRINT:sell:AVERAGE:%6.4lf %sEUR
GPRINT:sell:MIN:%6.4lf %sEUR
GPRINT:sell:LAST:%6.4lf %sEUR\n