[Therion] anchors and rebelays line options

Hi, I am trying to understand the effect of the anchors and rebelays line options. I can´t visually see any difference in the outputed map and looking in the code, I can´t find a place where the TT_LINE_TAG_ROPE_ANCHORS and TT_LINE_TAG_ROPE_REBELAYS flags are used. I can only find where they are set. Can someone explain to me how to use them and how to see their effects? Regards, Rodrigo Severo