# Quick Start

This page walks you through a first run with BASTA-Web using the provided example files. In a few minutes you can upload data, choose fitting options, and see the results.

## What you need

- Example [stellar data](_static/files/16CygA.ascii) and (optionally) [frequency](_static/files/16CygA.fre) files.
- An email address to receive the results.

## Step 1 — Upload your data

Open the BASTA-Web site to the first page, where you can **upload your stellar data**. The form will check for data format and content, making sure you have provided all the required information for your fitting goals.

Optional choices on this page:
- **Fit distance or parallax**. Requires sky coordinates and recognized photometric filters be included as columns in the stellar data file.
- **Include individual oscillation frequencies** by uploading additional stellar data for a detailed asteroseismic fit.

Tips:
- Start with the example files to see the expected layout.
- Address any flagged fields, then click **Check file format for BASTA** when validation succeeds.

## Step 2 — Choose BASTA controls
On the **BASTA controls** page you set how the fit is controlled.

At minimum:
- Select the **parameters to fit** (i.e., which columns you want to use from your uploaded file).
- Adjust **search range limits** to speed up the run.
- Pick a theoretical **stellar model grid** to fit against.
- If you have uploaded the example frequency file, you can enable advanced options here such as fitting against **frequency ratios**, **epsilon differences** and/or **glitches**.
- You can also control the weighting of the individual oscillation frequencies against your global asteroseismic (dnu and numax),  spectroscopic, and photometric surface parameters.

## Submit and review

Click **Start BASTA**. You will see a confirmation page for a successful run, and a results link (valid for 48hrs) will be emailed to you. Your results include:
- Best-fit parameters with uncertainties
- Diagnostic plots
- A summary of the inputs and selected controls

## Where to go next

For step-by-step guidance through the web forms, see the next two pages.