! err491_shade_lev_roundoff
! *sh* 4/98

! the default levels chosen by PLOT+ fail to capture the one data value

let onept = if i[i=1:3]+j[j=1:3] eq 6 then 0.8573645353
list/prec=10 onept
shade onept
ppl list levels

! but manual levels work OK
message
shade/lev=(0,1,1) onept
