function plotA2DARM(freq,varargin);
% bodeplot for Angle to DARM

spe=[varargin{:}];
Ndrv=size(spe,1);

loglog(freq,spe(1:Ndrv-1,:),freq,spe(Ndrv,:),'k--');
grid on;
xlabel('Frequency [Hz]');
ylabel('Displacement noise [m/rtHz]');