I have only one company but i want for my sale invoice report to have different header and logo and not of the company. Can you tell me how and please explain this line of code used for adding image in header as i am unable to understand it.

<img t-if="company.logo" t-att-src="'data:image/png;base64,%s' % company.logo" style="max-height: 70px, max-width: 70px;"/>
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I shall be very thankful.