Update tutorials/spectrum_analysis.ipynb
"To perform the joint fit:\n",
"\n",
"* [gammapy.spectrum.SpectrumDatasetOnOff](https://docs.gammapy.org/dev/api/gammapy.spectrum.SpectrumDatasetOnOff.html)\n",
- "* [gammapy.spectrum.SpectrumDatasetOnOffStacker](https://docs.gammapy.org/dev/api/gammapy.spectrum.SpectrumDatasetOnOffStacker.html)\n",
"* [gammapy.modeling.models.PowerLaw](https://docs.gammapy.org/dev/api/gammapy.modeling.models.PowerLaw.html)\n",
"* [gammapy.modeling.models.ExponentialCutoffPowerLaw](https://docs.gammapy.org/dev/api/gammapy.modeling.models.ExponentialCutoffPowerLaw.html)\n",
"* [gammapy.modeling.models.LogParabola](https://docs.gammapy.org/dev/api/gammapy.modeling.models.LogParabola.html)\n",
"source": [
"## Stack observations\n",
"\n",
- "And alternative approach to fitting the spectrum is stacking all observations first and the fitting a model. For this we first stack the individual datasets using the `SpectrumDatasetOnOffStacker` class:"
+ "And alternative approach to fitting the spectrum is stacking all observations first and the fitting a model. For this we first stack the individual datasets:"
]
},
{
