Fortrat diagram of n-propanol. The colored lines in the Fortrat diagram mark linkages of series transitions of Ag n-propanol, - DM-DR spectroscopy secured assignments in the W-band region (from J = 10 to J = 16). Tentative assignments of Κ_a = 1 transitions derived from the CP-FTMW measurement (Fig. B.1) are marked by the blue arrows. Considering found ^qR₁ series, another candidate transition is marked by the blue asterisk. A quantum mechanical model with experimental accuracy can solve the ambiguity of these tentative assignments. The gray area depicts the region of the Fortrat diagram in Fig. 4.