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Experiments on 160 Yb indicate three negative-parity bands up to I^21h~. All three ex^ perience a band crossing around a frequency HOJ = 0.36 MeV, a value intermediate to those of the first and second yrast backbends. The i 13 / 2 band in 161 Yb is observed up to Y +0 , it also has a strong upbend at this intermediate frequency. The fingerprint of a band crossing based upon the crossing frequency and gain in aligned angular momentum is demonstrated and the results compared to cranking-mod el calculations to suggest quasiparticle assignments for the bands.

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