<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">Hello</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">I am using mne.make_field_map function to plot fields on head surface in python and extrapolate fields to head surface option in MNE-C, both showed same strange results for my data.</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">You can find some figures at following link to see the results</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;"><br></div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;"><a href="https://www.dropbox.com/sh/x9fygyt853ipdia/AACdETxmNBQ8ahSHDTsbucQRa?dl=0">https://www.dropbox.com/sh/x9fygyt853ipdia/AACdETxmNBQ8ahSHDTsbucQRa?dl=0</a></div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;"><br></div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;"> I hope somebody could explain it.</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">The butterfly plot of evoked data for visual stimuli is in figure 1, topographical map at 110 ms is in figure 2, the field maps on helmet is in figure 3 and the field maps on head surface is in figure 4. I don’t understand the strong field on top of the skull surface in figure 4, which is no where seen in fields on helmet or on topographical map.</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;"><br></div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">Kind regards</div><div style="font-family: 'Segoe UI', Helvetica, Arial, sans-serif; font-size: medium; margin: 0px;">Bushra Riaz</div></body></html>