# Reference Cards

These printable reference cards are designed to help solar observers quickly identify spectral lines and configure SUNSCAN settings for optimal results. Each card fits the standard credit card format.

{% file src="/files/pJ64OFZpLl6OfEf359m5" %}

{% hint style="info" %}
**Important Notes**

Exposure times and gain settings are **indicative values** and must be adjusted based on:

* Sky transparency conditions
* Whether the Raspberry Pi HQ camera has been defiltered or not
* Local atmospheric seeing
  {% endhint %}

<figure><img src="/files/7QmUKSrJRE5KmWFJJJ1R" alt=""><figcaption></figcaption></figure>


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```
GET https://www.sunscan.net/use/observe/images-and-media.md?ask=<question>
```

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