>> d
! Unknown relation will be considered false.
<to be read again>
:
log->begingroup(if(EXPR2)=0:
0else:mlog((EXPR2))/mlog(10)fi)endgroup
<to be read again>
;
s_altitudebar->...d:=(EXPR1)-(EXPR0);dlog:=log(d);
if.dlog.mod1<0.301:dv:=2;e...
l.7428 ...1,(0.00750,0.75000,0.00000,0.00000))("")
;
Oh dear. I can't decide if the expression above is positive,
negative, or zero. So this comparison test won't be `true'.