Figure 5
From: Period Increase and Amplitude Distribution of Kink Oscillation of Coronal Loop

Panel (a) displays the evolution of n in /n ex . The green circles, purple diamonds, and pink squares mark n in /n ex derived by the DEM method for slits 4, 5 and 6, respectively. The black crosses represent n in /n ex by Equation (4). Panel (b) displays the evolution of n in (green circles, purple diamonds, and pink squares) and n ex (black solid circles). Panel (c) shows the evolution of the magnetic field strength, B.