function [delta,sym,asymR,asymL]=data_glasberg1990(varargin)
%DATA_GLASBERG1990 Notched-noise data for the ERB scale
%   Usage: [delta,sym,asymR,asymL]=data_glasberg1990;
%
%   `data_glasberg1990` returns data from Fig.5 (left panel only) from Glasberg &
%   Moore (1990) showing notched-noise data measured both in symmetrical
%   and asymetrical conditions at a center frequency (fc) of 100 Hz.
%
%   Examples:
%   ---------
%
%   To plot Fig. 5 use :::
%
%     data_glasberg1990('plot');
% 
%   References: glasberg1990daf moore1990auditory

% Parse input options
definput.flags.plot = {'noplot','plot'};
[flags,keyvals]  = ltfatarghelper({},definput,varargin);

% Plot fig.5 of Glasberg & Moore (1990)
x_delta = [0 .1 .2 .3 .4 .5];
y_sym = [87.5 85.63 84.38 81.25 78.13 73.75];
y_asymR = [83.75 80 75.63 70.63 63.75];
y_asymL = [85.63 83.75 78.13];

if flags.do_plot
    figure;
    plot(x_delta,y_sym,'*k'),hold on
    plot(x_delta(2:end),y_asymR,'>b')
    plot(x_delta(2:end-2),y_asymL,'<r')
    hold off
    axis([-.05 .55 61 94])
    xlabel('Deviation of nearer noise edge \Delta')
    ylabel('Signal level at threshold (dB SPL)')
    title('Notched-noise data from Moore et al. (1990), one subject')
    legend('Symmetric notch','Rightward asymmetric notch','Leftward asymmetric notch')
end;