Distributions of (a) the normalized data density in B x_{M S E} − Y_{M S E} space. (b) Whistler-mode wave occurrence, medians of (c) total magnetic field intensity B_t, (d) the positive linear waves growth rate γ(V_R) / f_{c e}, (e) η(V_R), (f) A(V_R), (h) plasma density, and (i) E(V_R) in the B x_{M S E} − Z_{M S E} space. Panel (g) represents normalized frequency distributions of whistler-mode waves. Data bins with sampling of less than 10 minutes in (d)-(i) are colored gray. The terms γ(V_R), η(V_R), E(V_R), and A(V_R) were calculated with wave frequency f = 0.035 f_{c e}. The overlapped white curves in (b) and (d)-(i) are the contour line of the 0.4% occurrence rate of whistler-mode waves.