RRDTool Command:

/usr/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-300 \
--title="Mail - PE2850 Temperature" \
--base=1000 \
--height=250 \
--width=800 \
--alt-autoscale-max \
--lower-limit=0 \
--vertical-label="degrees Fahrenheit" \
--slope-mode \
--font TITLE:12: \
--font AXIS:8: \
--font LEGEND:8: \
--font UNIT:8: \
DEF:a="/var/www/html/cacti/rra/mail_pe2850cputemp_942.rrd":pe2850CPUtemp:AVERAGE \
DEF:b="/var/www/html/cacti/rra/mail_pe2850cputemp_942.rrd":pe2850CPUtemp:LAST \
DEF:c="/var/www/html/cacti/rra/mail_pe2850cputemp_942.rrd":pe2850CPUtemp:MIN \
DEF:d="/var/www/html/cacti/rra/mail_pe2850cputemp_942.rrd":pe2850CPUtemp:MAX \
DEF:e="/var/www/html/cacti/rra/mail_pe2850ambienttemp_941.rrd":pe2850AMBIENTtemp:AVERAGE \
DEF:f="/var/www/html/cacti/rra/mail_pe2850ambienttemp_941.rrd":pe2850AMBIENTtemp:LAST \
DEF:g="/var/www/html/cacti/rra/mail_pe2850ambienttemp_941.rrd":pe2850AMBIENTtemp:MIN \
DEF:h="/var/www/html/cacti/rra/mail_pe2850ambienttemp_941.rrd":pe2850AMBIENTtemp:MAX \
DEF:i="/var/www/html/cacti/rra/mail_pe2850planartemp_943.rrd":pe2850PLANARtemp:AVERAGE \
DEF:j="/var/www/html/cacti/rra/mail_pe2850planartemp_943.rrd":pe2850PLANARtemp:LAST \
DEF:ba="/var/www/html/cacti/rra/mail_pe2850planartemp_943.rrd":pe2850PLANARtemp:MIN \
DEF:bb="/var/www/html/cacti/rra/mail_pe2850planartemp_943.rrd":pe2850PLANARtemp:MAX \
DEF:bc="/var/www/html/cacti/rra/mail_pe2850risertemp_944.rrd":pe2850RISERtemp:AVERAGE \
DEF:bd="/var/www/html/cacti/rra/mail_pe2850risertemp_944.rrd":pe2850RISERtemp:LAST \
DEF:be="/var/www/html/cacti/rra/mail_pe2850risertemp_944.rrd":pe2850RISERtemp:MIN \
DEF:bf="/var/www/html/cacti/rra/mail_pe2850risertemp_944.rrd":pe2850RISERtemp:MAX \
CDEF:cdefa=a,10,/,1.8,*,32,a,+,10,/,1.8,*,32,+ \
CDEF:cdefb=b,10,/,1.8,*,32,b,+,10,/,1.8,*,32,+ \
CDEF:cdefd=c,10,/,1.8,*,32,c,+,10,/,1.8,*,32,+ \
CDEF:cdefe=d,10,/,1.8,*,32,d,+,10,/,1.8,*,32,+ \
CDEF:cdeff=e,10,/,1.8,*,32,e,+,10,/,1.8,*,32,+ \
CDEF:cdefg=f,10,/,1.8,*,32,f,+,10,/,1.8,*,32,+ \
CDEF:cdefi=g,10,/,1.8,*,32,g,+,10,/,1.8,*,32,+ \
CDEF:cdefj=h,10,/,1.8,*,32,h,+,10,/,1.8,*,32,+ \
CDEF:cdefba=i,10,/,1.8,*,32,i,+,10,/,1.8,*,32,+ \
CDEF:cdefbb=j,10,/,1.8,*,32,j,+,10,/,1.8,*,32,+ \
CDEF:cdefbd=ba,10,/,1.8,*,32,ba,+,10,/,1.8,*,32,+ \
CDEF:cdefbe=bb,10,/,1.8,*,32,bb,+,10,/,1.8,*,32,+ \
CDEF:cdefbf=bc,10,/,1.8,*,32,bc,+,10,/,1.8,*,32,+ \
CDEF:cdefbg=bd,10,/,1.8,*,32,bd,+,10,/,1.8,*,32,+ \
CDEF:cdefbi=be,10,/,1.8,*,32,be,+,10,/,1.8,*,32,+ \
CDEF:cdefbj=bf,10,/,1.8,*,32,bf,+,10,/,1.8,*,32,+ \
LINE1:cdefa#FF0000FF:"CPU"  \
GPRINT:cdefb:LAST:"    Cur\:%8.2lf %s"  \
GPRINT:cdefa:AVERAGE:"Avg\:%8.2lf %s"  \
GPRINT:cdefd:MIN:"Min\:%8.2lf %s"  \
GPRINT:cdefe:MAX:"Max\:%8.2lf %s\n"  \
LINE1:cdeff#00CF00FF:"Ambient"  \
GPRINT:cdefg:LAST:"Cur\:%8.2lf %s"  \
GPRINT:cdeff:AVERAGE:"Avg\:%8.2lf %s"  \
GPRINT:cdefi:MIN:"Min\:%8.2lf %s"  \
GPRINT:cdefj:MAX:"Max\:%8.2lf %s\n"  \
LINE1:cdefba#4444FFFF:"Planar"  \
GPRINT:cdefbb:LAST:" Cur\:%8.2lf %s"  \
GPRINT:cdefba:AVERAGE:"Avg\:%8.2lf %s"  \
GPRINT:cdefbd:MIN:"Min\:%8.2lf %s"  \
GPRINT:cdefbe:MAX:"Max\:%8.2lf %s\n"  \
LINE1:cdefbf#005199FF:"Riser"  \
GPRINT:cdefbg:LAST:"  Cur\:%8.2lf %s"  \
GPRINT:cdefbf:AVERAGE:"Avg\:%8.2lf %s"  \
GPRINT:cdefbi:MIN:"Min\:%8.2lf %s"  \
GPRINT:cdefbj:MAX:"Max\:%8.2lf %s\n"

RRDTool Says:

ERROR: RPN final stack size != 1