Fix bug in writing c_OCLU preamble

src/cluster/cluster.cpp

@@ -235,12 +235,12 @@ void cluster(const string& config_file, const string& data_file, const string& o
 #ifdef USE_ILP64
       sprintf(virtual_line, " %5d%5d%5d%5ld%5d%5d%5d%5d%5d\n",
 	      nsph, cid->c1->li, cid->c1->le, gconf->mxndm, gconf->in_pol, gconf->npnt,
-	      gconf->npntts, gconf->iavm, gconf->iavm
+	      gconf->npntts, gconf->iavm, gconf->isam
 	      );
 #else
       sprintf(virtual_line, " %5d%5d%5d%5d%5d%5d%5d%5d%5d\n",
 	      nsph, cid->c1->li, cid->c1->le, gconf->mxndm, gconf->in_pol, gconf->npnt,
-	      gconf->npntts, gconf->iavm, gconf->iavm
+	      gconf->npntts, gconf->iavm, gconf->isam
 	      );
 #endif // USE_ILP64
       p_output->append_line(virtual_line);