Matlab's contour and colormap ignores input values

I'm plotting a contour using the contourf function in Matlab and using sound pressure levels and the associated coordinates as an input. The maximum SPL is over 78 dB. The contourf function somehow is only taking values until 75 dB into account but I need a finer resolution what is covering values until the maximum one. Now all values over 75 dB are in the same color.

                        % Plotting
                        figure();
                        contourf(xObsGnewGrid,yObsGnewGrid,obsSplMaxInterp,'LineColor','none');
                        axis equal;
                        clrb = colorbar('eastoutside','Ticks',[0:2:100]);
                        zlab = get(clrb,'ylabel');
                        set(zlab,'String','SPL [dBA]');
                        ylabel('Lateral Position [m]');
                        xlabel('Longitudinal Position [m]');
                        xlabel('Longitudinal Position [m]');

Answer 1

[mldmnn]

An increase of the contour levels worked for me!

[Adam Danz]

If Jonas' solution worked for you, you should accept that answer, not yours (which is only a comment). That way when people reference this question in the future, they will be pointed to the correct answer.

Answer 2

[jonas]

You can increase the resolution by adjusting the levelstep property

contourf(x,y,z,'levelstep',2)

Adjust the limits on the colorbar by

colorbar('limits',[min(obsSplMaxInterp(:) max(obsSplMaxInterp(:))])