Solitary wave profile with its corresponding electric field and FFT power spectra. (a) Solitary profiles versus ζ. (b) Corresponding bipolar electric field for different values of l_z where l_z = 0.1 (dashed orange), l_z = 0.15 (mint green), and l_z = 0.2 (dot-dashed pink). (c) Corresponding FFT power spectra of the electric fields. The x-axis represents the log₁₀ v where v is the frequency in Hz and the y-axis resembles the power of the electric field expressed in units of decibels db() with frequency peaks at f_p = 0.155 Hz (dashed orange), f_p = 0.177 Hz (mint green), and f_p = 0.212 Hz (dot-dashed pink).