class_docstr: Class for SPM99 variant of basic Analyze header
  
  SPM99 variant adds the following to basic Analyze format:
  
  * voxel origin;
  * slope scaling of data.
class_docstr_tok: ["Class","for","SPM99","variant","of","basic","Analyze","header","SPM99","variant","adds","the","following","to","basic","Analyze","format",":","*","voxel","origin",";","*","slope","scaling","of","data","."]
code: def _get_checks(klass):
      checks = super()._get_checks()
      return checks + (klass._chk_origin,)
  
imports: import warnings
  from io import BytesIO
  import numpy
  from .None import analyze
  from .batteryrunners import Report
  from .optpkg import optional_package
  from .spatialimages import HeaderDataError, HeaderTypeError
label_desc: Use image node_id 3 for calling the Spm99AnalyzeHeader obj's underlying member method code with example usage: obj._get_checks(klass) and returns: unknown