<p><span style="padding: 3px 10px; border-radius: 5px; color: #ffffff; font-weight: bold; display: inline-block; background-color: #ff0000;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;External Email - Use Caution&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></p><p></p><div dir="ltr"><div>Dear MNE experts,</div><div><br></div><div>I would like to apply MNE to whiten times-series data which were saved as .cvs, rather than .fif. However, in the demo code &quot;<span class="gmail-n">b</span><span class="gmail-p">,</span> <span class="gmail-n">a</span> <span class="gmail-o">=</span> <a href="https://martinos.org/mne/stable/generated/mne.time_frequency.fit_iir_model_raw.html#mne.time_frequency.fit_iir_model_raw" title="View documentation for mne.time_frequency.fit_iir_model_raw"><span class="gmail-n">fit_iir_model_raw</span></a><span class="gmail-p">(</span><span class="gmail-n">raw</span><span class="gmail-p">,</span> <span class="gmail-n">order</span><span class="gmail-o">=</span><span class="gmail-n">order</span><span class="gmail-p">,</span> <span class="gmail-n">picks</span><span class="gmail-o">=</span><span class="gmail-n">picks</span><span class="gmail-p">,</span> <span class="gmail-n">tmin</span><span class="gmail-o">=</span><span class="gmail-mi">60</span><span class="gmail-p">,</span> <span class="gmail-n">tmax</span><span class="gmail-o">=</span><span class="gmail-mi">180</span><span class="gmail-p">)</span>&quot; , the raw refers to the raw fif file, right? May I ask how should I transform the format from cvs to fif, or if &#39;fit_iir_model_raw&#39; could recognize data matrix directly? The data matrix now I have is a small matrix, such as 300 x 300. Any suggestions would be much appreciated.</div><div><br></div><div>Best regards,</div><div><br></div><div>Lizhi<br></div></div>