<html><head></head><body><div style="font-family:times new roman, new york, times, serif;font-size:16px;"><div><div><div><div><span><span>Dear Sir/Madam,</span></span></div><div><br><span><span></span></span><br></div><span><span>My name is Mansoureh Aghabeig and I am working in the ICNT lab in Torun, Poland as a Ph.D. student. Currently, I am working on time-frequency analysis with <g class="gr_ gr_21 gr-alert gr_gramm gr_inline_cards gr_run_anim Style multiReplace" id="21" data-gr-id="21"><g class="gr_ gr_19 gr-alert gr_spell gr_inline_cards gr_disable_anim_appear ContextualSpelling ins-del multiReplace" id="19" data-gr-id="19">fieldtrip</g> .</g> But I obtained very strange TFR results. Please find the attachment.</span></span></div><div><br><div><span></span><span>It is clear in the attached plot the lower frequencies dominate the higher one. In fact, there is the 1/f power spectrum effect. I think one solution for solving this problem is normalizing <g class="gr_ gr_34 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del" id="34" data-gr-id="34">over power</g> spectrum but I do not know how can I do it in <g class="gr_ gr_37 gr-alert gr_gramm gr_inline_cards gr_run_anim Style multiReplace" id="37" data-gr-id="37"><g class="gr_ gr_36 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" id="36" data-gr-id="36">fieldtrip</g> .</g> I would be appreciated if you kindly guide me.</span><div><br><div><br><div>Thanks in advance<br></div></div></div></div></div><span><span></span></span><br></div><div><br></div><div class="ydp58b95928signature"><div style="font-size:16px;"><div><font style="background-color:rgb(255, 255, 255);" color="#4c76a2" face="bookman old style, new york, times, serif" size="1">Mansoureh Aghabeig</font></div><div><font style="background-color:rgb(255, 255, 255);" color="#4c76a2" face="bookman old style, new york, times, serif" size="1"> منصوره آقابیگ</font></div></div></div></div></div></body></html>