In the third parashah of Shema' (maftir from P' Shelach) we have a divergence of cantillation on the words ולא תתורו. In R' Wolf Heidenheim (see Koren for a contempary example) these words are cantillated with kadma veazla (ול֨א תת֜ורו) whereas in Breuer (Keter Yerushalayim) they are tied together and vocalised with an azla-geresh (ולא־תת֜ורו).
What is the mesorah of these two variants ?