The plotting of spectrogram

I use the coding to run spectrogram.. spectrogram(y,2500,200,100,200000,'yaxis') view(-77,72) shading interp colorbar off Then, the picture appear which is x,y,z axis. I try to read the value of spectrogram using this code :

s=spectrogram(y,2500,200,100,200000,'yaxis')

s =

They have the value of s. But i dont what value for? x-axis what?..y-axis what??..