The best way to handle this problem is to keep a set of discrete levels at low excitation energies and a set of binned levels at high energies. The set at low energies is supposed to be known and can be taken from databases (for example, the [ENSDF] database, which has information from what has been already measured with the high resolution technique). The set at high energies is unknown and does not overlap with the known part. At the end of this calculation, the whole region of levels inside the Q value window (known and unknown) is binned.