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<https://github.com/IHP-GmbH/IHP-Open-PDK/issues/3|#3 missing model for `sg13_lv_nmos`>
Issue created by <https://github.com/proppy|proppy>
Trying to run the following ngspice simulation:

```
.title sg13g2_inv_1
.lib /content/IHP-Open-PDK/ihp-sg13g2/libs.tech/ngspice/models/SG13G2_hbt_woStatistics.hsp.lib
.include /content/IHP-Open-PDK/ihp-sg13g2/libs.ref/sg13g2_stdcell/spice/sg13g2_stdcell.spice

X1 GATE DRAIN VPWR 0 0 VGND sg13g2_inv_1

Vgnd  VGND  0     0
Vdd   VPWR  VGND  5.0
R     VPWR  DRAIN 50k
Vin   GATE  VGND  DC    0V
.op
.option post nomod
.end

.control
save all GATE DRAIN
dc Vin 0 5.0 0.01
display
wrdata output.txt GATE DRAIN
.endc
```

will result in the following error:

```
Error: unknown subckt: x1.xx1 vpwr gate 0 vpwr x1.sg13_lv_nmos x1.w=740.00n x1.l=130.00n <http://x1.ng|x1.ng>=1 <http://x1.ad|x1.ad>=0 <http://x1.as|x1.as>=0 x1.pd=0 <http://x1.ps|x1.ps>=0 m=1
    Simulation interrupted due to error!
```

See the following notebook which reproduce the issue:  
<https://colab.research.google.com/gist/proppy/5582eeae8d2e2eccb48cd591b904185f/ihp-pdk-playground.ipynb|https://colab.research.google.com/gist/proppy/5582eeae8d2e2eccb48cd591b904185f/ihp-pdk-playground.ipynb>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

<https://github.com/IHP-GmbH/IHP-Open-PDK/issues/3|#3 missing model for `sg13_lv_nmos`>
Issue closed as completed by <https://github.com/KrzysztofHerman|KrzysztofHerman>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>