TARDIS is an open-source Monte Carlo radiative-transfer code used for spectral synthesis in 1D models of supernova ejecta. It enables quick and efficient spectral modeling of supernovae. 

The core package of the TARDIS Project is Tardis. To explore the full project, discover additional packages, and connect with the community, visit the project website.

The TARDIS SDEC plot visualizes which atoms photon packets interact with before they escape the ejecta and contribute to the output spectrum's absorption and emission features. However, the SDEC plot does not visualize where these interactions occur within the ejecta. This information can be beneficial to astronomers who want to understand which regions of the ejecta are responsible for important features in the output spectrum. This project develops the LIV (Last Interaction Velocity) Plot that plots the number of photon packet interactions as a velocity function for each element present in the ejecta. One such example is shown in the interactive plot below.

The Last Interaction Velocity Plot tracks and displays the velocities at which different elements (or species) last interacted with packets in the simulation. For documentation visit this page.
We can create a highly informative and visually appealing Last Interaction Velocity plot using Matplotlib, If you're using the Last Interaction Velocity plot for exploration, consider creating an interactive version with Plotly. This allows you to zoom, pan, and inspect data values by hovering, resizing the scale, and more conveniently.

The plots have various options providing the users with more control over how your last interaction velocity looks:

• species_list: List of species to plot.

• nelements: Number of elements to include in the plot. The most interacting elements are included.

• packets_mode: Packet mode, either 'virtual' or 'real'.

• packet_wvl_range: Wavelength range to restrict the analysis of escaped packets. It should be a quantity having units of Angstrom, containing two values - lower lambda and upper lambda i.e.[lower_lambda, upper_lambda] * u.AA

• ax: To plot on an Axis of a plot you're already working with, e.g. for subplots. (matplotlib only)

• figsize: To resize the plot as per your requirements. (matplotlib only)

• fig: To plot the last interaction velocity plot on a figure you are already using e.g. for subplots. (plotly only)

• graph_height: To specify the height of the graph as needed. (plotly only)

• cmapname: Colormap name.

• xlog_scale: If True, the x-axis is scaled logarithmically.

• ylog_scale: If True, the y-axis is scaled logarithmically.

• num_bins: Number of bins for regrouping within the same range.

• velocity_range: Limits for the x-axis. If specified, overrides any automatically determined limits.