diff --git a/lib/IDS/DeReKoVecs/Read.pm b/lib/IDS/DeReKoVecs/Read.pm
index 0da0cf4..f75ca90 100644
--- a/lib/IDS/DeReKoVecs/Read.pm
+++ b/lib/IDS/DeReKoVecs/Read.pm
@@ -7,7 +7,6 @@
 
 my $src_file      = undef;
 
-our $mergedEnd=0;
 our $opt_p = 5676;
 our $opt_C;
 
@@ -31,7 +30,7 @@
 use Mojo::Cache;
 use Exporter qw(import);
 
-our @EXPORT = qw(init_net load_sprofiles getVocabSize getDowntimeCalendar getCollocationAssociation getClassicCollocatorsCached getSimilarProfiles getSimilarProfilesCached getBiggestMergedDifferences filter_garbage get_neighbours getVecs getWordNumber dump_vecs dump_for_numpy cos_similarity_as_json get_version getPosWiseW2VCollocators configure_cache cache_stats);
+our @EXPORT = qw(init_net load_sprofiles mergeVectors getVocabSize getDowntimeCalendar getCollocationAssociation getClassicCollocatorsCached getSimilarProfiles getSimilarProfilesCached getBiggestMergedDifferences getMergedEnd filter_garbage get_neighbours getVecs getWordNumber dump_vecs dump_for_numpy cos_similarity_as_json get_version getPosWiseW2VCollocators configure_cache cache_stats);
 
 my $cccache = Mojo::Cache->new(max_keys => $CC_CACHE_MAX_KEYS); # classic collocator cache
 my $spcache = Mojo::Cache->new(max_keys => $SP_CACHE_MAX_KEYS); # similar profile cache
@@ -80,8 +79,12 @@
 sub getClassicCollocatorsCached {
   my ($c, $word, $compare_to) = @_;
   my $s2 = "";
-  if($word > $mergedEnd) {
-    $word-=$mergedEnd;
+  # The collocator db is the one of the primary model, which sits at
+  # [merged_end, words) in the merged vocabulary, so its ranks have to be
+  # shifted back before they can be looked up.
+  my $merged_end = getMergedEnd();
+  if($word >= $merged_end) {
+    $word -= $merged_end;
   }
 
   my $pipe;
@@ -133,6 +136,10 @@
 
 sub getSimilarProfilesCached {
   my ($c, $word) = @_;
+  # like the collocator db, the precomputed profiles belong to the primary
+  # model, see getClassicCollocatorsCached()
+  my $merged_end = getMergedEnd();
+  $word -= $merged_end if $word >= $merged_end;
   my $profiles = $opt_C ? undef : $spcache->get($word);
   if(!defined $profiles) {
     $profiles = getSimilarProfiles($word);