Can dark matter - electron scattering explain the DAMA annual modulation consistent with XENON100 constraints?

Understand

For many years annually modulating $\sim$ keV scintillations have been observed in the DAMA/NaI and DAMA/Libra experiments.

• A dark matter - electron scattering interpretation is now favoured given the stringent constraints on nuclear recoil rates obtained by LUX, SuperCDMS and other experiments.
• Very recently, the XENON100 experiment has observed a modest annual modulation in their electron recoil events (2.8 $\sigma$ C.L.) with phase consistent with that of the DAMA experiments.
• However, they also found a stringent upper limit on the unmodulated rate, which suggests that any dark matter - electron scattering interpretation of these annual modulations must involve a large modulation fraction $\stackrel{>}{\sim} 50\%$.