X-Git-Url: http://mmka.chem.univ.gda.pl/gitweb/?a=blobdiff_plain;f=source%2Fxdrfpdb%2Fsrc-M%2Farcos.f;h=69810ea0c66bb1053bc43099918f93b61f7a4639;hb=2900dbb2e7e1c992d8603e52c0d080ee009318c2;hp=afc6724defe02b89ca7c9abd89f7f03d34618e45;hpb=0a0b19df2e0f4d0081a0df1b16ff63950010daa5;p=unres.git

diff --git a/source/xdrfpdb/src-M/arcos.f b/source/xdrfpdb/src-M/arcos.f
index afc6724..69810ea 100644
--- a/source/xdrfpdb/src-M/arcos.f
+++ b/source/xdrfpdb/src-M/arcos.f
@@ -2,7 +2,7 @@
       implicit real*8 (a-h,o-z)
       include 'COMMON.GEO'
       IF (DABS(X).LT.1.0D0) GOTO 1
-      ARCOS=0.5D0*(PI-DSIGN(1.0D0,X)*PI)
+      ARCOS=0.5D0*(PI+DSIGN(1.0D0,X)*PI)
       RETURN
     1 ARCOS=DACOS(X)
       RETURN