xyyxxf 发表于 2013-8-20 10:28 
嗯,这个办法试了,能够解决这个问题,但又遇到了一个新的问题,如果两条线相距很近,并且如果都有label, 则 ...
there are 3 ways to work around it
(1) rescale the y-axis to increase the space between the two reference lines;
(2) use different LABELPOS or LABELLOC options for the two REFLINE statements;
(3) omit labels in REFLINE statements, but use the ANNOTATION facility to add the labels