i need explanation of this IDL code

;extracting internal wave signature sroro 2 mar 2021 pro iwtransecto_2021 to=fltarr(1500, 5000) openr,1,'C:\Users\13364\Desktop\Prof Roland Re readu, 1, to close, 1 tvscl, 10.0*alog10(rebin(te, 300, 1000)) window, 0,xsize=300, ysize=1000 loadct, e tieto(0:999, 2ee: 1199) window, 1,xsize=1000, ysize=1000 tvsel, 10.0"alog10(t1) tl=rot(ti, -29.0) t2=10.0*alog10(t1) t2(*,399)=max(t2) t2*,600)=max(t2) tvsel, t2 window, 2,xsize=1000, ysize=400 plot, [0,1000], [0, 60000), psym=3 loadct, 33 for j=6,199 do oplot, t1,400+), color=j+25 plemean(ti(480:599), dimention=2) loadct, e oplot,pi, thick=3.0 stop end