Add a band without geo-coding to a product

I’ve had a similar problem months ago, and @marpet gave me this solution. Here’s the link to the topic

You can have access to all parameters for each function using -h. For example gpt -h merge

Usage:
  gpt merge [options] 

Description:
  Allows merging of several source products by using specified 'master' as reference product.


Source Options:
  -SmasterProduct=<file>    The master, which serves as the reference, e.g. providing the geo-information.
                            This is a mandatory source.

Parameter Options:
  -PgeographicError=<float>    Defines the maximum lat/lon error in degree between the products. If set to NaN no check for compatible geographic boundary is performed
                               Default value is '1.0E-5f'.

Graph XML Format:
  <graph id="someGraphId">
    <version>1.0</version>
    <node id="someNodeId">
      <operator>Merge</operator>
      <sources>
        <masterProduct>${masterProduct}</masterProduct>
        <sourceProducts>${sourceProducts}</sourceProducts>
      </sources>
      <parameters>
        <includes>
          <include>
            <productId>string</productId>
            <name>string</name>
            <newName>string</newName>
            <namePattern>string</namePattern>
            <exclRegex>string</exclRegex>
          </include>
          <.../>
        </includes>
        <excludes>
          <exclude>
            <productId>string</productId>
            <name>string</name>
            <newName>string</newName>
            <namePattern>string</namePattern>
            <exclRegex>string</exclRegex>
          </exclude>
          <.../>
        </excludes>
        <geographicError>float</geographicError>
      </parameters>
    </node>
  </graph>