def default_params():
    """
    Sets the default ploting parameters used in both
    image/map plots as well as wiggle plots.
    
    This function takes no arguments.
    """
    plotParams = {}
    plotParams['pltformat'] = 'pdf'
    plotParams['view_mode'] = 'light'
    plotParams['isolevel'] = 0.7
    plotParams['xlabel'] = ''
    plotParams['ylabel'] = ''
    plotParams['zlabel'] = ''
    plotParams['xu'] = ''
    plotParams['yu'] = ''
    plotParams['zu'] = ''
    plotParams['colormap'] = 'magma'
    plotParams['colorbar'] = False
    plotParams['shading'] = 'flat'
    plotParams['vmin'] = 0.0
    plotParams['vmax'] = 1.0
    plotParams['levels'] = 100
    plotParams['invert_xaxis'] = False
    plotParams['invert_yaxis'] = False
    plotParams['invert_zaxis'] = False
    plotParams['show_scatterer'] = False
    plotParams['show_sources'] = True
    plotParams['show_receivers'] = True
    plotParams['pclip'] = 1.0
    plotParams['tu'] = ''
    plotParams['au'] = ''
    plotParams['data_title'] = 'Data'
    plotParams['impulse_title'] = 'Impulse Response'
    plotParams['fu'] = ''
    plotParams['fmin'] = 0
    plotParams['fmax'] = None
    plotParams['freq_title'] = 'Mean Amplitude Spectrum'
    plotParams['freq_ylabel'] = 'Amplitude'
    return plotParams
