# TEM 1D inversion

**URL:** <https://simpeg.discourse.group/t/tem-1d-inversion/587>\
**Category:** Electromagnetics\
**Created:** [July 2, 2024, 2:39pm UTC](https://simpeg.discourse.group/t/tem-1d-inversion/587 "2024-07-02T14:39:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![aalmpanis](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@aalmpanis](https://simpeg.discourse.group/u/aalmpanis)\
**Post date:** [July 2, 2024, 2:39pm UTC](https://simpeg.discourse.group/t/tem-1d-inversion/587/1 "2024-07-02T14:39:35Z")

</div>

I have some field TEM data for 1D inversion and trying to define a RawWaveform (basically to get the field waveform); howver, it gives me this error:

→ [114](file:///C:/Users/au756649/AppData/Local/anaconda3/envs/SimPeg\_FrostC/Lib/site-packages/SimPEG/electromagnetics/time\_domain/simulation\_1d.py:114) times = rx.times - wave.time\_nodes[:, None] [115](file:///C:/Users/au756649/AppData/Local/anaconda3/envs/SimPeg\_FrostC/Lib/site-packages/SimPEG/electromagnetics/time\_domain/simulation\_1d.py:115) times[times \< 0.0] = 0.0

**AttributeError: ‘RawWaveform’ object has no attribute ‘time\_nodes’**

Any ideas how to solve this? see image for the waveform.

 ![image](https://global.discourse-cdn.com/free1/uploads/simpeg/original/1X/bc5da58269fc2f2210d68d74c236109ad6b44efb.png)