Energy levels, transition frequencies and Einstein A coefficients for the vibrational ground state of HC₇N are based on McCarthy et al (2000). Collisional rates are scaled HC₇N-He rates from Bop & Lique (2025) and cover temperatures in the range from 5 to 50 K including energy levels up to J=72 for collisions with H₂.

The second datafile provides higher accuracy for the lowest 36 rotational states of HC₇N and is recommended for temperatures below 15 K.