You can click this link
thingspeak.com/channels/9/charts/1?bgcolor=a2a2a2&color=444444&dynamic=false&type=spline&width=auto&height=auto&round=2&start=2017-03-31 00:00:00&end=2017-03-31 00:01:00&offset=-05.00
it is channel 9 field 1 chart for today since midnight for a lapse of 1 minute showing some points about each 15 seconds, checked in Chrome-W10 but I believe any modern browser will do.
$.getJSON('https://api.thingspeak.com/channels/' + channel_id + '/fields/' + field_number + '.json?offset=0&round=2&results=' + results + '&api_key=' + api_key, function( .... etc, etc
Hope this very little information is of some help
Thank you, piajola. It does help me a lot!
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