Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Grace Victoria Cox
Table title:
Filmography
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Role </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2014–2015 </td><td class="highlighted"  colspan=1 rowspan=1 > Under the Dome </td><td class="highlighted"  colspan=1 rowspan=1 > Melanie Cross </td><td colspan=1 rowspan=1 > Main role (Season 2); Guest (Season 3), 16 episodes </td></tr>
<tr> <td colspan=1 rowspan=1 > 2016 </td><td colspan=1 rowspan=1 > Manson's Lost Girls </td><td colspan=1 rowspan=1 > Lynette "Squeaky" Fromme </td><td colspan=1 rowspan=1 > TV film </td></tr>
<tr> <td colspan=1 rowspan=1 > 2017 </td><td colspan=1 rowspan=1 > Twin Peaks </td><td colspan=1 rowspan=1 > Charlotte </td><td colspan=1 rowspan=1 > 1 episode </td></tr>
<tr> <td colspan=1 rowspan=1 > 2017 </td><td colspan=1 rowspan=1 > The Archer </td><td colspan=1 rowspan=1 > Emily </td><td colspan=1 rowspan=1 > TV film </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2018 </td><td class="highlighted"  colspan=1 rowspan=1 > Heathers </td><td class="highlighted"  colspan=1 rowspan=1 > Veronica Sawyer </td><td colspan=1 rowspan=1 > Main role, 10 episodes </td></tr>
<tr> <td colspan=1 rowspan=1 > 2019 </td><td colspan=1 rowspan=1 > Now Apocalypse </td><td colspan=1 rowspan=1 > Amber </td><td colspan=1 rowspan=1 > Recurring role </td></tr>
<tr> <td colspan=1 rowspan=1 > 2019 </td><td colspan=1 rowspan=1 > The Society </td><td colspan=1 rowspan=1 > Lexie </td><td colspan=1 rowspan=1 > Main role </td></tr>
</table>
Question:
What were Grace Victoria Cox's longest running roles?
Answer:
Grace Victoria Cox is known for playing as Melanie Cross in Under the Dome (2014–15) and as Veronica Sawyer in Heathers (2018).