Quantum number overview of the analysis of (a) Aa n-propanol and (b) Ag n-propanol. All rotational energy levels of assigned transitions are visualized with the J quantum numbers on the x-axis, K_a quantum numbers on the y-axis, and K_c quantum numbers are either depicted by squares or circles for K_c = J - K_a or K_c = J - K_a+ 1, respectively. Filled markers depict quantum numbers of assigned transitions whose frequencies are fit to experimental accuracy using our final spectroscopic model in Table 2. The empty circles mark assigned transitions which are not included in the final analysis, but can be used for astronomical searches. For Aa n-propanol, we note that we do not differentiate between A and Ε components of each rotational energy level as in overwhelming majority of cases both components are assigned per transition. For Ag n-propanol, the rotational energy levels of the 0⁺ and 0⁻ tunneling states are given in blue and red, respectively. Triangles are used for transitions whose tunneling state assignments have only been guessed so far.