SPIA has been released in version 3.3. The new update includes several new inversion possibilities:
SPIA DC: Support for IP data. IP data can now be imported for processing and inversion.
SPIA TEM: Inversion of TEM data with IP effects. We have implemented the Cole-Cole and MPA inversion methods for modelling TEM data that are affected by IP effects. Besides a resistivity model, the inversions will also result in models for chargeability, tau and C parameters.
Save any inversion model to use as new starting model. For all new features and fixes, see the release history. To get the new SPIA release, download the installer here. The new release is only working on 64-bit operative systems.