function [freq,sp] = import_1206data(IMC_loop,ErrFB,varargin)
if strcmp(ErrFB,'RTM MIXER MON') || strcmp(ErrFB,'RTM PZT MON')
    data = importdata('EF1206_1.txt');
    tempfreq = data(:,1);
    if strcmp(IMC_loop,'on')
        disp('IMC loop on')
        if strcmp(ErrFB,'RTM MIXER MON')
            tempsp = data(:,2);
        elseif strcmp(ErrFB,'RTM PZT MON')
            tempsp = data(:,4);
        end
    else
        disp('IMC loop off')
        if strcmp(ErrFB,'RTM MIXER MON')
            tempsp = data(:,3);
        elseif strcmp(ErrFB,'RTM PZT MON')
            tempsp = data(:,5);
        end
    end
    [temp_ff1, temp_abs1] = mntrim(0,2,tempfreq,tempsp);
    [temp_ff2, temp_abs2] = mntrim(2.001,1e2,tempfreq,tempsp);
    [temp_ff3, temp_abs3] = mntrim(1.001e2,1e9,tempfreq,tempsp);
    temp_ff2 = downsample(temp_ff2,5);
    temp_abs2 = downsample(temp_abs2,5);
    temp_ff3 = downsample(temp_ff3,50);
    temp_abs3 = downsample(temp_abs3,50);
    freq = [temp_ff1; temp_ff2; temp_ff3];
    sp = [temp_abs1; temp_abs2; temp_abs3];
elseif strcmp(ErrFB,'sensor')
    data = importdata('N1206_4.txt');
    freq = data(:,1);
    if mnismember(varargin,'KOACH_on')
        sp = data(:,2);
    else
        sp = data(:,3);
    end

elseif strcmp(ErrFB,'sensor RefCav')
    data = importdata('N1206_10.txt');
    freq = data(:,1);
    if mnismember(varargin,'KOACH_off')
        sp = data(:,2);
    else
        sp = data(:,3);
    end
end