“…If χ(−1) = 1, the trivial zeros of L χ are s = −2n for all non-negative integers n. If χ(−1) = −1, the trivial zeros of L χ are s = −2n − 1 for all non-negative integers n. Beside the trivial zeros of L χ , there are infinitely many non-trivial zeros lying in the strip 0 < Re(s) < 1. For a = 0, it can be shown that there is always a a-point in some neighbourhood of any trivial zero of L χ with sufficiently large negative real part, and with finitely many exceptions there are no other in the left half-plane, thus the number of these a-points having real part in [−R, 0] is asymptotically 1 2 R. The remaining a-points all lie in a strip 0 < Re(s) < A, where A depends on a, and we call these non-trivial a-points (see [16,19]). For a positive number T , let N a χ (T ) denote the number of non-trivial a-points ρ a = β a + iγ a of L χ with |γ a | ≤ T .…”