function plot_spALL( num_std )

if (~exist('num_std'))
    num_std = 5;
end

load( sprintf( 'sp%d_data_ext', num_std ) );

fig = 664;
figure( fig ); clf;
%min_z = min(min(z_data));
%max_z = max(max(z_data));
%axis( [sp_t(1) sp_t(end) min_z max_z] );
axis( [sp_t(1) sp_t(end) -.015 .015] );
AX = axis;

for channel = 1:64
    z = z_data(:,channel);
    sp = sp_data{channel};
    
    subplot(8,8,channel);

    plot( sp_t, z ); hold on;
    plot( [sp_t(1) sp_t(end)], [threshold(channel) threshold(channel)], 'g', 'linewidth', 2 );
    plot( [sp_t(1) sp_t(end)], [-threshold(channel) -threshold(channel)], 'g', 'linewidth', 2 );
    plot( sp, zeros(length(sp),1), 'rx' );
    if ( channel <= 56 )
        set( gca, 'XTickLabel', '' );       % don't display Xticks
    end
    axis( AX );
    tx = text( 0.65*AX(1)+0.35*AX(2), 0.05*AX(3)+1.3*AX(4), ...
               sprintf( 'Ch %d', channel ) );
    set( tx, 'fontsize', 10, 'fontweight', 'bold' );
    disp( sprintf( 'Channel %d done.', channel ) );
%    drawnow;
%    pause;
end