reset data
reset i/o
reset plot control
dimension 500 30
skip 4
read mass.dat t id y bal s ds
y1label MICROGRAMS
x1label TIME IN YEARS
xlimits 75 90
x2label STANDARD DEVIATIONS ON BALANCE 12
characters * blank blank blank
lines blank solid dotted dotted
let ss=s*s
let sp=mean ss
let sp=sqrt(sp)
let scc=s-s+sp
let f = fppf(.99,3,351)
let f=sqrt(f)
let sul=f*scc
multiplot 1 1
plot s scc sul vs t